You seem to have a problem with your theme by default (in Lubuntu).
For having the version of MLT, .... take a look at this FAQ :
https://answers.launchpad.net/openshot/+faq/2245
This one should help you.


2013/12/17 Daniel <email address hidden>

> ** Also affects: fedora
>    Importance: Undecided
>        Status: New
>
> --
> You received this bug notification because you are a member of OpenShot
> Bugs, which is subscribed to OpenShot Video Editor.
> https://bugs.launchpad.net/bugs/1259804
>
> Title:
>   crashes with every edit
>
> Status in OpenShot Video Editor:
>   New
> Status in Fedora:
>   New
>
> Bug description:
>   It started out infrequently. Now every time I do anything, the next
>   time I click play or move the playhead, it crashes.
>
>   Lubuntu 13.04 on a 6 year old Dell Dimension 32 bit
>
>   Installed openshot through lubuntu software center.
>
>   I don't know how to find version of MLT.
>
>   From terminal:
>
>   media@Media:~$ openshot
>
>   ------------------------- ERROR 1 ------------------------------
>   Failed to import 'from openshot import main'
>   Error Message: cannot import name main
>   ----------------------------------------------------------------
>   --------------------------------
>      OpenShot (version 1.4.3)
>   --------------------------------
>   Process no longer exists: 2092.  Creating new pid lock file.
>
>   Detecting formats, codecs, and filters...
>   WARNING: gnome-keyring:: couldn't connect to:
> /run/user/media/keyring-XABvpk/pkcs11: No such file or directory
>   ---
>   video_codecs:
>     - a64multi
>     - a64multi5
>     - asv1
>     - asv2
>     - bmp
>     - cljr
>     - dnxhd
>     - dpx
>     - dvvideo
>     - ffv1
>     - ffvhuff
>     - flashsv
>     - flv
>     - gif
>     - h261
>     - h263
>     - h263p
>     - huffyuv
>     - jpegls
>     - ljpeg
>     - mjpeg
>     - mpeg1video
>     - mpeg2video
>     - mpeg4
>     - msmpeg4v2
>     - msmpeg4
>     - pam
>     - pbm
>     - pcx
>     - pgm
>     - pgmyuv
>     - png
>     - ppm
>     - qtrle
>     - rawvideo
>     - roqvideo
>     - rv10
>     - rv20
>     - sgi
>     - snow
>     - svq1
>     - targa
>     - tiff
>     - v210
>     - v410
>     - wmv1
>     - wmv2
>     - zlib
>     - zmbv
>     - libschroedinger
>     - libtheora
>     - libvpx
>   ...
>   ---
>   audio_codecs:
>     - aac
>     - ac3
>     - ac3_fixed
>     - alac
>     - eac3
>     - flac
>     - mp2
>     - nellymoser
>     - real_144
>     - vorbis
>     - wmav1
>     - wmav2
>     - roq_dpcm
>     - adpcm_adx
>     - g722
>     - g726
>     - adpcm_ima_qt
>     - adpcm_ima_wav
>     - adpcm_ms
>     - adpcm_swf
>     - adpcm_yamaha
>     - libgsm
>     - libgsm_ms
>     - libspeex
>     - libvorbis
>   ...
>   ---
>   formats:
>     - a64
>     - ac3
>     - adts
>     - adx
>     - aiff
>     - amr
>     - asf
>     - ass
>     - asf_stream
>     - au
>     - avi
>     - avm2
>     - cavsvideo
>     - crc
>     - daud
>     - dirac
>     - dnxhd
>     - dts
>     - dv
>     - eac3
>     - ffm
>     - ffmetadata
>     - filmstrip
>     - flac
>     - flv
>     - framecrc
>     - framemd5
>     - g722
>     - gif
>     - gxf
>     - h261
>     - h263
>     - h264
>     - image2
>     - image2pipe
>     - ipod
>     - ivf
>     - latm
>     - m4v
>     - md5
>     - matroska
>     - matroska
>     - mjpeg
>     - mlp
>     - mmf
>     - mov
>     - mp2
>     - mp3
>     - mp4
>     - mpeg
>     - vcd
>     - mpeg1video
>     - dvd
>     - svcd
>     - mpeg2video
>     - vob
>     - mpegts
>     - mpjpeg
>     - mxf
>     - mxf_d10
>     - null
>     - nut
>     - ogg
>     - oma
>     - alaw
>     - mulaw
>     - f64be
>     - f64le
>     - f32be
>     - f32le
>     - s32be
>     - s32le
>     - s24be
>     - s24le
>     - s16be
>     - s16le
>     - s8
>     - u32be
>     - u32le
>     - u24be
>     - u24le
>     - u16be
>     - u16le
>     - u8
>     - psp
>     - rawvideo
>     - rm
>     - RoQ
>     - rso
>     - rtp
>     - rtsp
>     - sap
>     - segment
>     - smjpeg
>     - sox
>     - spdif
>     - srt
>     - swf
>     - 3g2
>     - 3gp
>     - truehd
>     - rcv
>     - voc
>     - wav
>     - webm
>     - yuv4mpegpipe
>     - alsa
>     - oss
>   ...
>   state saved
>
>   ** (openshot:2174): WARNING **: Invalid borders specified for theme
> pixmap:
>           /usr/share/themes/Lubuntu-default/gtk-2.0/images/null.png,
>   borders don't fit within the image
>
>   ** (openshot:2174): WARNING **: Invalid borders specified for theme
> pixmap:
>
> /usr/share/themes/Lubuntu-default/gtk-2.0/images/scrollbar_horizontal.png,
>   borders don't fit within the image
>
>   ** (openshot:2174): WARNING **: Invalid borders specified for theme
> pixmap:
>           /usr/share/themes/Lubuntu-default/gtk-2.0/images/null.png,
>   borders don't fit within the image
>
>   ** (openshot:2174): WARNING **: Invalid borders specified for theme
> pixmap:
>
> /usr/share/themes/Lubuntu-default/gtk-2.0/images/scrollbar_vertical.png,
>   borders don't fit within the image
>
>   ** (openshot:2174): WARNING **: Invalid borders specified for theme
> pixmap:
>
> /usr/share/themes/Lubuntu-default/gtk-2.0/images/scrollbar_horizontal-sel.png,
>   borders don't fit within the image
>   on_mnuOpenProject_activate called with self.GtkImageMenuItem
>   [mp3 @ 0x99305a0] max_analyze_duration reached
>   [mp3 @ 0x9932c00] max_analyze_duration reached
>   [mp3 @ 0x996b8e0] max_analyze_duration reached
>   [mp3 @ 0x9942d80] max_analyze_duration reached
>   [mp3 @ 0x9983ee0] max_analyze_duration reached
>   [mp3 @ 0x9974460] max_analyze_duration reached
>   [mp3 @ 0x997b900] max_analyze_duration reached
>   [mp3 @ 0x9988c20] max_analyze_duration reached
>   [mp3 @ 0x99bb8c0] max_analyze_duration reached
>   [mp3 @ 0x99ed760] max_analyze_duration reached
>   project state modified
>   state saved
>   NEW SDL CONSUMER
>   [mp3 @ 0x9d97da0] max_analyze_duration reached
>   [mp3 @ 0x9d9c480] max_analyze_duration reached
>   [mp3 @ 0x9dbc9e0] max_analyze_duration reached
>   [mp3 @ 0x9dbfc40] max_analyze_duration reached
>   [mp3 @ 0x9e036c0] max_analyze_duration reached
>   [mp3 @ 0x9e0cf40] max_analyze_duration reached
>   [mp3 @ 0x9df3ee0] max_analyze_duration reached
>   [mp3 @ 0x9e320e0] max_analyze_duration reached
>   [mp3 @ 0x9e4d540] max_analyze_duration reached
>   [mp3 @ 0x9e1bf80] max_analyze_duration reached
>
>   ** (openshot:2174): WARNING **: Invalid borders specified for theme
> pixmap:
>
> /usr/share/themes/Lubuntu-default/gtk-2.0/images/scrollbar_vertical-sel.png,
>   borders don't fit within the image
>   [mp3 @ 0xa6d157c0] max_analyze_duration reached
>   [mp3 @ 0xa6d13ba0] max_analyze_duration reached
>   [mp3 @ 0xa6d09600] max_analyze_duration reached
>   [mp3 @ 0xa6d40460] max_analyze_duration reached
>   on_tlbAddMarker_clicked
>   project state modified
>   state saved
>   [mp3 @ 0x99732a0] max_analyze_duration reached
>   [mp3 @ 0x8ac0c40] max_analyze_duration reached
>   [mp3 @ 0x9a18d20] max_analyze_duration reached
>   [mp3 @ 0x8fd8ee0] max_analyze_duration reached
>   [mp3 @ 0x91d0f80] max_analyze_duration reached
>   [mp3 @ 0x9043dc0] max_analyze_duration reached
>   [mp3 @ 0x944e980] max_analyze_duration reached
>   [mp3 @ 0x9249dc0] max_analyze_duration reached
>   [mp3 @ 0x8ac6520] max_analyze_duration reached
>   [mp3 @ 0x8aca160] max_analyze_duration reached
>   Segmentation fault (core dumped)
>
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>
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-- 
Olivier
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