This is the command in emulation station that starts mupen64 and generates the seg fault. /opt/retropie/supplementary/runcommand/runcommand.sh 1 "cd /opt/retropie/emulators/mupen64plus-rpi/test/ && ./mupen64plus %ROM%"
I don’t see anything immediately wrong with it (for instance, the path exists on my system and there is a file called mupen64plus there), but I’m not an expert. I do notice that none of the other commands in the es_systems.cfg file perform a cd first and THEN a separate run command. Maybe that is the source of the error?