I deleted the KEPUB and recreated it without changing any settings. The settings screenshots can be found here: http://imgur.com/a/off2P The created KEPUB is 357KB, the input EPUB is 3.05MB. The folders of the debug output have the following sizes: input - 3,44MB parsed - 11MB processed - 713KB structure - 3,43MB The log is as follows: calibre Debug log calibre 1.14 [64bit] isfrozen: True is64bit: True Windows-8-6.2.9200 Windows ('64bit', 'WindowsPE') ('Windows', '8', '6.2.9200') Python 2.7.5 Windows: ('8', '6.2.9200', '', 'Multiprocessor Free') Starting up... Started up in 10.41 seconds with 8 books Worker Launch took: 0.162999868393 Job: 1 Convert book 1 of 1 (Der Pfad Des Friedvollen Kriegers) finished Convert book 1 of 1 (Der Pfad Des Friedvollen Kriegers) C:\Program Files\Calibre2\pylib.zip\dateutil\parser.py:336: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal Resolved conversion options calibre version: 1.14.0 {'asciiize': False, 'author_sort': None, 'authors': None, 'base_font_size': 0.0, 'book_producer': None, 'change_justification': u'original', 'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., '\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']", 'chapter_mark': u'pagebreak', 'comments': None, 'cover': u'C:\\Users\\CHRIST~1\\AppData\\Local\\Temp\\calibre_fv7vib\\o5gbu2.jpeg', 'debug_pipeline': u'D:\\tmp', 'dehyphenate': True, 'delete_blank_paragraphs': True, 'disable_font_rescaling': False, 'dont_split_on_page_breaks': False, 'duplicate_links_in_toc': False, 'embed_all_fonts': False, 'embed_font_family': None, 'enable_heuristics': False, 'epub_flatten': False, 'epub_inline_toc': False, 'epub_toc_at_end': False, 'expand_css': False, 'extra_css': None, 'extract_to': None, 'filter_css': u'', 'fix_indents': True, 'flow_size': 260, 'font_size_mapping': None, 'format_scene_breaks': True, 'html_unwrap_factor': 0.4, 'input_encoding': None, 'input_profile': , 'insert_blank_line': False, 'insert_blank_line_size': 0.5, 'insert_metadata': False, 'isbn': None, 'italicize_common_cases': True, 'keep_ligatures': False, 'kepub_clean_markup': True, 'kepub_hyphenate': True, 'kepub_replace_lang': True, 'language': None, 'level1_toc': None, 'level2_toc': None, 'level3_toc': None, 'line_height': 0.0, 'linearize_tables': False, 'margin_bottom': 5.0, 'margin_left': 5.0, 'margin_right': 5.0, 'margin_top': 5.0, 'markup_chapter_headings': True, 'max_toc_links': 50, 'minimum_line_height': 120.0, 'no_chapters_in_toc': False, 'no_default_epub_cover': False, 'no_inline_navbars': False, 'no_svg_cover': False, 'output_profile': , 'page_breaks_before': u'/', 'prefer_metadata_cover': False, 'preserve_cover_aspect_ratio': False, 'pretty_print': True, 'pubdate': None, 'publisher': None, 'rating': None, 'read_metadata_from_opf': u'C:\\Users\\CHRIST~1\\AppData\\Local\\Temp\\calibre_fv7vib\\zsse_0.opf', 'remove_fake_margins': True, 'remove_first_image': False, 'remove_paragraph_spacing': False, 'remove_paragraph_spacing_indent_size': 1.5, 'renumber_headings': True, 'replace_scene_breaks': u'', 'search_replace': '[]', 'series': None, 'series_index': None, 'smarten_punctuation': False, 'sr1_replace': None, 'sr1_search': None, 'sr2_replace': None, 'sr2_search': None, 'sr3_replace': None, 'sr3_search': None, 'start_reading_at': None, 'subset_embedded_fonts': False, 'tags': None, 'timestamp': None, 'title': None, 'title_sort': None, 'toc_filter': None, 'toc_threshold': 6, 'toc_title': None, 'unsmarten_punctuation': False, 'unwrap_lines': True, 'use_auto_toc': False, 'verbose': 2} InputFormatPlugin: EPUB Input running on C:\Users\CHRIST~1\AppData\Local\Temp\calibre_fv7vib\1j95bh.epub Found HTML cover OEBPS/Text/titlepage.xhtml Input debug saved to: D:\tmp\input Parsing all content... Parsing OEBPS/Text/e9783641078751_c04.html ... Parsing OEBPS/Text/e9783641078751_cop01.html ... Parsing OEBPS/Text/e9783641078751_toc01.html ... Parsing OEBPS/Text/e9783641078751_ded01.html ... Parsing OEBPS/Text/e9783641078751_c05.html ... Parsing OEBPS/Text/e9783641078751_fm01.html ... Parsing OEBPS/Text/e9783641078751_c06.html ... Parsing OEBPS/Text/e9783641078751_fm02.html ... Parsing OEBPS/Text/e9783641078751_bm01.html ... Parsing OEBPS/Styles/page_styles.css ... Parsing OEBPS/Text/e9783641078751_frw01.html ... Parsing OEBPS/Text/e9783641078751_c07.html ... Parsing OEBPS/Text/titlepage.xhtml ... Parsing OEBPS/Text/e9783641078751_p03.html ... Parsing OEBPS/Text/e9783641078751_c01.html ... Parsing OEBPS/Text/e9783641078751_c08.html ... Parsing OEBPS/Text/e9783641078751_p01.html ... Parsing OEBPS/Styles/stylesheet.css ... Parsing OEBPS/Text/e9783641078751_c02.html ... Parsing OEBPS/Text/e9783641078751_ack01.html ... Parsing OEBPS/Text/cover.html ... Parsing OEBPS/Text/e9783641078751_c03.html ... Parsing OEBPS/Text/e9783641078751_p02.html ... Reading TOC from NCX... Parsed HTML written to: D:\tmp\parsed Merging user specified metadata... Detecting structure... Structured HTML written to: D:\tmp\structure Flattening CSS and remapping font sizes... Source base font size is 12.00000pt Removing fake margins... Found 20 items of level: div_1 Found 3 items of level: div_3 Found 11 items of level: div_2 Found 2302 items of level: p_2 Found 5 items of level: p_3 Ignoring level div_3 Ignoring level p_3 div_1 left margin stats: Counter({u'': 13}) div_1 right margin stats: Counter({u'': 13}) div_2 left margin stats: Counter() div_2 right margin stats: Counter() p_2 left margin stats: Counter({u'0': 2302}) p_2 right margin stats: Counter({u'0': 2302}) Cleaning up manifest... Trimming unused files from manifest... Trimming u'OEBPS/Images/8.jpg' from manifest Trimming u'OEBPS/Text/titlepage.xhtml' from manifest Processed HTML written to: D:\tmp\processed Creating KePub Output... Rescaling image from 600x800 to 512x684 OEBPS/Images/cover.jpg Splitting markup on page breaks and flow limits, if any... Looking for large trees in OEBPS/Text/e9783641078751_c04.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_cop01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_toc01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_ded01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c05.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_fm01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c06.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_fm02.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_bm01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_frw01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c07.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_p03.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c08.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_p01.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c02.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_ack01.html... No large trees found Looking for large trees in OEBPS/Text/cover.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_c03.html... No large trees found Looking for large trees in OEBPS/Text/e9783641078751_p02.html... No large trees found Copying file 'C:\Users\CHRIST~1\AppData\Local\Temp\calibre_fv7vib\sup75c_KePubOutputPluginInfo' to 'C:\Users\CHRIST~1\AppData\Local\Temp\calibre_fv7vib\p9zked_epub_container' as 'plugininfo.kte' {'smarten_punctuation': False, 'extended_kepub_features': True, 'replace_lang': True, 'hyphenate': True, 'clean_markup': True} KoboTouchExtended:common:modify_epub:Found cover image ID 'cover' KoboTouchExtended:common:modify_epub:Setting cover-image property Forcing cleanup for file OEBPS/Text/cover.html Forcing cleanup for file OEBPS/Text/e9783641078751_ack01.html Forcing cleanup for file OEBPS/Text/e9783641078751_bm01.html Forcing cleanup for file OEBPS/Text/e9783641078751_c01.html Forcing cleanup for file OEBPS/Text/e9783641078751_c02.html Forcing cleanup for file OEBPS/Text/e9783641078751_c03.html Forcing cleanup for file OEBPS/Text/e9783641078751_c04.html Forcing cleanup for file OEBPS/Text/e9783641078751_c05.html Forcing cleanup for file OEBPS/Text/e9783641078751_c06.html Forcing cleanup for file OEBPS/Text/e9783641078751_c07.html Forcing cleanup for file OEBPS/Text/e9783641078751_c08.html Forcing cleanup for file OEBPS/Text/e9783641078751_cop01.html Forcing cleanup for file OEBPS/Text/e9783641078751_ded01.html Forcing cleanup for file OEBPS/Text/e9783641078751_fm01.html Forcing cleanup for file OEBPS/Text/e9783641078751_fm02.html Forcing cleanup for file OEBPS/Text/e9783641078751_frw01.html Forcing cleanup for file OEBPS/Text/e9783641078751_p01.html Forcing cleanup for file OEBPS/Text/e9783641078751_p02.html Forcing cleanup for file OEBPS/Text/e9783641078751_p03.html Forcing cleanup for file OEBPS/Text/e9783641078751_toc01.html Forcing cleanup for file titlepage.xhtml Cleaning markup for file OEBPS/Text/cover.html Cleaning markup for file OEBPS/Text/e9783641078751_ack01.html Cleaning markup for file OEBPS/Text/e9783641078751_bm01.html Cleaning markup for file OEBPS/Text/e9783641078751_c01.html Cleaning markup for file OEBPS/Text/e9783641078751_c02.html Cleaning markup for file OEBPS/Text/e9783641078751_c03.html Cleaning markup for file OEBPS/Text/e9783641078751_c04.html Cleaning markup for file OEBPS/Text/e9783641078751_c05.html Cleaning markup for file OEBPS/Text/e9783641078751_c06.html Cleaning markup for file OEBPS/Text/e9783641078751_c07.html Cleaning markup for file OEBPS/Text/e9783641078751_c08.html Cleaning markup for file OEBPS/Text/e9783641078751_cop01.html Cleaning markup for file OEBPS/Text/e9783641078751_ded01.html Cleaning markup for file OEBPS/Text/e9783641078751_fm01.html Cleaning markup for file OEBPS/Text/e9783641078751_fm02.html Cleaning markup for file OEBPS/Text/e9783641078751_frw01.html Cleaning markup for file OEBPS/Text/e9783641078751_p01.html Cleaning markup for file OEBPS/Text/e9783641078751_p02.html Cleaning markup for file OEBPS/Text/e9783641078751_p03.html Cleaning markup for file OEBPS/Text/e9783641078751_toc01.html Cleaning markup for file titlepage.xhtml Copying file 'C:\Users\CHRIST~1\AppData\Local\Temp\calibre_fv7vib\kepub_im2ciy_hyphenate' to 'C:\Users\CHRIST~1\AppData\Local\Temp\calibre_fv7vib\p9zked_epub_container' as 'kte-css/hyphenation.css' Adding reference to kte-css/hyphenation.css to file OEBPS/Text/cover.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_ack01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_bm01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c02.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c03.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c04.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c05.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c06.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c07.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_c08.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_cop01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_ded01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_fm01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_fm02.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_frw01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_p01.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_p02.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_p03.html Adding reference to kte-css/hyphenation.css to file OEBPS/Text/e9783641078751_toc01.html Adding reference to kte-css/hyphenation.css to file titlepage.xhtml KoboTouchExtended:common:modify_epub:Overriding OPF language KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/cover.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_ack01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_bm01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c02.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c03.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c04.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c05.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c06.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c07.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_c08.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_cop01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_ded01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_fm01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_fm02.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_frw01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_p01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_p02.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_p03.html KoboTouchExtended:common:modify_epub:Overriding content file language :: OEBPS/Text/e9783641078751_toc01.html KoboTouchExtended:common:modify_epub:Overriding content file language :: titlepage.xhtml KoboTouchExtended:common:modify_epub:Adding extended Kobo features to Der Pfad Des Friedvollen Kriegers by Dan Millman Adding Kobo spans to OEBPS/Text/cover.html Adding Kobo spans to OEBPS/Text/e9783641078751_ack01.html Adding Kobo spans to OEBPS/Text/e9783641078751_bm01.html Adding Kobo spans to OEBPS/Text/e9783641078751_c01.html Adding Kobo spans to OEBPS/Text/e9783641078751_c02.html Adding Kobo spans to OEBPS/Text/e9783641078751_c03.html Adding Kobo spans to OEBPS/Text/e9783641078751_c04.html Adding Kobo spans to OEBPS/Text/e9783641078751_c05.html Adding Kobo spans to OEBPS/Text/e9783641078751_c06.html Adding Kobo spans to OEBPS/Text/e9783641078751_c07.html Adding Kobo spans to OEBPS/Text/e9783641078751_c08.html Adding Kobo spans to OEBPS/Text/e9783641078751_cop01.html Adding Kobo spans to OEBPS/Text/e9783641078751_ded01.html Adding Kobo spans to OEBPS/Text/e9783641078751_fm01.html Adding Kobo spans to OEBPS/Text/e9783641078751_fm02.html Adding Kobo spans to OEBPS/Text/e9783641078751_frw01.html Adding Kobo spans to OEBPS/Text/e9783641078751_p01.html Adding Kobo spans to OEBPS/Text/e9783641078751_p02.html Adding Kobo spans to OEBPS/Text/e9783641078751_p03.html Adding Kobo spans to OEBPS/Text/e9783641078751_toc01.html Adding Kobo spans to titlepage.xhtml KEPUB output written to C:\Users\CHRIST~1\AppData\Local\Temp\calibre_fv7vib\dp9rc1.kepub