Can't Find Audio Device

I've seen several threads referring to a similar problem, but none that seemed to have a good resolution. I'll try again.

Had a problem where Adobe Audition 3.01 wouldn't open the Edit view, so I deleted and reinstalled. Everything was fine.

When I next tried to open Audition, it said that it couldn't find an audio device and wouldn't open at all. Tried rebooting, deleting the system preferences folder, and even installing a different audio interface. All to no avail. If I repair the program in Windows control panel program repair/delete options and reboot, that will allow me to use it that one time, but if I close Audition, it will then say again that it can't find an audio device when I try to reopen.

Audition 3.01

Windows 7 64 bit

MOTU 828mk3 hybrid, via Firewire

Also tried an Audient ID14 USB, and all other audio programs, Izotope RX5, Audacity, WireReady work fine.