Today I had occasion to open a medium size assy created in SW2011 - in SW2012. I merely told it to open as if I expected it to do it just fine, which I did. However, what I found was that it appeared to unsuppress everything in all the assy configs. So a RH & LH assy now had all stuff unsuppressed, and of course all the overlapping mates turning red.
Has anyone else been seeing this? Hopefully it's just something about this particular assy and its subs.