actually, I took the crashing build (rev.7711), I removed all obj/ except for emu/cpu and emu/sound, recompiled the rest of the source and the command started to work without any crash...
I start to suspect that the crash was due (in my case) to a mix of rev.7702 and 7703 obj... that would explain why both on my mac and the symbol builds were not crashing: they had been clean compiled!
hence, I'm trying to rebuild from scratch rev.7711 and see if it fixes the problems. I will let you know the result