Yes, switching from X11 to OpenGL immediately crashes. However, any operation in Settings/preferences will sooner or later lead to a crash even with X11. Starting with .bcast1 in /tmp I didn't crash, not even switching to OpenGL. I enclose .bcast1, .bcast5 and cin5.log at the link: https://www.dropbox.com/s/4afv3wz4mfw601u/cin5_log.zip?dl=0 In the terminal I have: [paz@arch-paz ~]$ LANGUAGE="en_US:us" LANG="en_US.utf8" CIN_CONFIG=/tmp/bcast1 /home/paz/cinelerra5/cinelerra-5.1/bin/./cin Cinelerra: Could not set locale. Cinelerra Infinity - built: Mar 3 2020 20:57:57 git://git.cinelerra-gg.org/goodguy/cinelerra.git (c) 2006-2019 Heroine Virtual Ltd. by Adam Williams 2007-2020 mods for Cinelerra-GG by W.P.Morrow aka goodguy Cinelerra is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. There is absolutely no warranty for Cinelerra. BC_Signals::x_error_handler: error_code=2 opcode=151,24 id=0x0 BadValue (integer parameter out of range for operation) audio0 pad 4 0 (4) FFMPEG::open_decoder: some stream have bad times: /home/paz/video_editing/prova/1080/ocra.png FFMPEG::open_decoder: some stream have bad times: /home/paz/video_editing/prova/1080/ocra.png FFMPEG::open_decoder: some stream have bad times: /home/paz/video_editing/prova/1080/ocra.png audio0 pad 8 0 (8) FFMPEG::open_decoder: some stream have bad times: /home/paz/video_editing/prova/1080/rodents.png FFMPEG::open_decoder: some stream have bad times: /home/paz/video_editing/prova/1080/rodents.png (process:319633): Gdk-WARNING **: 22:04:40.289: locale not supported by C library (process:319633): Gtk-WARNING **: 22:04:40.291: Locale not supported by C library. Using the fallback 'C' locale. CALF DEBUG: instance 0x5558b371cf30 data 0x5558b37f67f0 CALF DEBUG: calf 0x7f7cb7d94750 cpi 0x7f7cb759af40 Session time: 0:05:39 Cpu time: user: 0:00:59.024 sys: 0:00:04.476