I hope this doesn't post twice, but the last attempt didn't seem to work. Also, I should add, that this this happens every time, not a random kind of thing. If Sooperlooper receives two MIDI Stop events before receiving a MIDI Start, it crashes:
Ok, more details.
Automatically set Latency... checked
Automatically Disable... checked
Pause all loops on incoming MIDI Stop Event... checked
On Main screen
sync to: MidiClock
mute quant, odub quant, repl quant: checked
sync, playback sync: checked on all loops (four)
Hope that helps!