rc7 was the final release candidate build for 7.2, the seventh in the usual series of them. They're meant to fix bugs, not introduce new ones. I often run them, for fun and testing. One expects bugs like this — assuming it is a bug — in the rc builds but normally they're meant to be fixed before the final release which happened this week.
Switching back to a working kernel is what I did for today, yeah. I have no particular reason to need 7.2 right now and don't have time to try and track down the bug.