I've confirmed this behaviour - starting the game with music enabled causes this for me (on AMD-64).
Starting from a terminal with the "-nomidi" flag does not cause this behaviour for me.
the -nomidi flag has been a long-time recommendation for avoiding this on linux from upstream - According to the release notes for 101.0 ( http://forum.simutrans.com/index.php?topic=1205.0 ),
"disabling sound and midi will be now saved and will disable them completely to avoid the SDL_mixer troubles"
I've confirmed this behaviour - starting the game with music enabled causes this for me (on AMD-64).
Starting from a terminal with the "-nomidi" flag does not cause this behaviour for me.
the -nomidi flag has been a long-time recommendation for avoiding this on linux from upstream - According to the release notes for 101.0 ( http:// forum.simutrans .com/index. php?topic= 1205.0 ),
"disabling sound and midi will be now saved and will disable them completely to avoid the SDL_mixer troubles"