So much of this forum is about the issues (and complaints), we have with the game, I for one want to thank The Lindens for fabulous fix on the linked object migration bug!
I have a base set of prims that I have used to build a larger sized building, they have been unlinked and linked several times and still look as pristine as the first time I set them up.
This was a serious bug that really hurt us builders.
Thank you, Lindens, for the fix, it has been noticed and appreciated.