Is anyone else having problems with AirDrop after upgrading to 10.7.2? I went to use it for the first time since upgrading tonight and it wouldn't work. On my computer, when I would send a file to the other computer it would pop up a message saying the other user disconnected/denied the connection...even though the 'other' person didn't as no box popped up saying there was an incoming file. Going from my wife's MacBook to my MacBook Pro it was saying, "The Apple ID certificate for [my username] is invalid." Did a search on the Apple support board and saw there ARE people having this problem, but no known solution.