Hi, I installed the update the day it came out. I'm using a USB HDD connected to my Airport Extreme n as TimeMachine Volume. First: TimeMachine still works, BUT anytime i switch off the external HDD or power up my MB in a non-home-environment I get the '!' in the menu-bar-logo, that he couldn't do his backup job becuse there was trouble. I never had this problem before. He never tried to backup while his backup wasn't connected Does anyone else have this issue?