What issues have you seen reported that were caused by the 12v3 release?
I am running 12v3 with no issues...except a bug/change in how Merge Variables and Conditional Formatting was working.
What about thick line in a portal? For someone who manages over 100 files and thousands of layouts that's a huge show stopper.
True...forgot about that one. For us it's not a show stopper. It's bad, and it needs to be fixed...however, I can apply the update and wait for FM to release a fix.