Suddenly, VLC crashes when I jump forward in videos. It’s 100% reproducible. Reboot didn’t fix it. Starting on the shell, I see:

Assertion !p->parent->stash_hwaccel failed at src/libavcodec/pthread_frame.c:649

Turns out, it’s this: https://forum.mxlinux.org/viewtopic.php?t=81068 Before I even went online, I assumed that turning off hardware acceleration might help. And it does. Phew!