My setup: Dual G4 867, OS 10.4.9., DP 5.11, MIDIMAN 4x4 driving an Access Virus C and a Korg MS 2000r, MOTU 828 audio interface, M-Audio Radium controller.
Earlier tonight, my MIDI was fine. Then, it just stopped working.
My problems began when I tried to freeze a whole bunch of tracks and got a message telling me I did not have enough stereo busses. So I switched my studio setup from 24 to 32 busses. I froze the tracks and put them into a clipping window, with the intention of using them in a new project.
But when I tried to create a new file, DP crashed and I had to force quit. Then it wouldn't open until I restarted the computer. I tried again several times, with the same results, so I deleted the files in the clipping wondow and I switched it back to 24 busses.
I was then able to create a new project, but suddenly, the MIDI didn't work.
What I've done:
Tried other programs besides DP. No MIDI. Reason freezes on trying to open.
Repaired Permissions.
Went to Audio MIDI Setup, all my devices showed up, but when I chose "test device" and clicked the icons for my synths, no response. I did, however, get a series of beeps when I first chose "test device."
Updated OS (was 10.4.

Still, nothing.
I'm quite frustrated. If anyone has any other suggestions, I'd love to hear them.
Thanks.