SW crash when i try to Pack and Go

Hello everyone.

When i try to do a Pack and Go on a mold assembly, SW crashes.

i didn't experince this in either SW 2010 or SW 2011, and i have just updated all my personal library SW-files to 2012 format. 

Does anyone elske than my experience trouble with the Pack and Go?

I use SW 2012 SP4.0 x64

SolidworksGeneral