Created attachment 104822 [details] gdb trace and version info When I have tried to add a .mkv clip the kdenlive has crashed with the SIGSEGV.
Tested with 18.08.3 on Windows. No crash when I drag MKV on the timeline. It seems the problem is solved. I closed this bug. If it still appears in the latest version, please feel free to re-open it and update the affected version number.