Maciej I made a debug build and ran it using debug as you suggested. Unfortunately, as of this build I cannot replicate the bug. The good news is I now know what to do if it appears again. It was absolutely consistent in the past. Brian Application: kicad Version: (5.0.0-rc2-dev-269-gff3f22987), debug build Libraries: wxWidgets 3.0.3 libcurl/7.57.0 OpenSSL/1.0.2n (WinSSL) zlib/1.2.11 libidn2/2.0.4 libssh2/1.8.0 nghttp2/1.29.0 Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW Build Info: wxWidgets: 3.0.3 (wchar_t,wx containers,compatible with 2.8) Boost: 1.66.0 Curl: 7.57.0 Compiler: GCC 7.3.0 with C++ ABI 1011 Build settings: USE_WX_GRAPHICS_CONTEXT=OFF USE_WX_OVERLAY=OFF KICAD_SCRIPTING=ON KICAD_SCRIPTING_MODULES=ON KICAD_SCRIPTING_WXPYTHON=ON KICAD_SCRIPTING_ACTION_MENU=OFF BUILD_GITHUB_PLUGIN=ON KICAD_USE_OCE=ON KICAD_SPICE=ON -----Original Message----- From: