Won't record in Au CS6 !

This is driving me insane! I'm using CS6, yes I know, old. Anyway, I open Au, choose waveform and the settings I have used hundreds of times before,  click to record and it just sits there! I have closed all other programs, done all the maintenence things, rebooted the computer, absolutely everything I can think of short of uninstalling and reinstalling the program. This is new since the last time I recorded. I haven't purposfully changed anything, it just won't freakin' go! Please help!