Yes, I can confirm here!
(similar setup.. MacPro, 4-core, OS X 10.6.8 )
If I try to swap the SEM for another instrument (even another one from Arturia), it starts to load the new instrument, then crashes.On the other hand, I can swap from any other Arturia instrument, without problem.
I have attached a .zip of the DP7 crashlog, if that can help
Vic