I've bought the MMV and downloaded the miniMg demo, and after trying both on 3 different protools versions under 3 different mac os (9, 10.2 and 10.3) I'm sad to say that they keep on crashing. Most often when, as you mentioned, try too remove them, delete the track or try too make the track inactive. The only way (that I know of) too remove them from a session, is to start a new session and import all the tracks except the ones with arturia plugins :shock:
Sadly it seems that Arturias policy is to release new software rather than update the older ones to a state where they are usable. At the moment they are simply not worth using in protools (haven't tried them as vst's) unless you want to go through the hassle of tracking them and then removing them using the method mentioned above.
Personally I think Arturias soft synths are among the top 5, if not the best, synth emulations out there regarding sound and accuarcy in emulation (I have an old model D minimmog next to me), but they are so full of bugs that I have given up using my MMV in protools. Even the VST plugins that i use with the FXpansion wrapper are more stable than the native RTAS Arturias. So far it seems like a total waste of money but I hope that future (and I mean near future) updates will cure their shortcomings
