This is driving me nuts. I created an assembly in 2010. Time goes by no issue. Fast foward to 2011 SP3 and my mirrored part is now nonconcentric. If i open in SP2 and save all is ok. If i open in SP3 or 4 and save it goes non concentric. My reseller tells me it is because SW uses center of gravity to mirror. Im not satisfied with this answer for the obvious reasons. Ive got lots of time into an assembly that i cant use anymore. Reseller says they will alert me of SR status.
Please help. Im getting frustrated with my resellers confidence in themselves.