I'm currently running the current release .604 with a Dell All-In-One and an M2PC. This setup has worked flawlessly for months. Now, when I first hook everything up and start up M-PC, my M2PC will not respond. No touchscreen display, faders don't work, no playback section, nothing. It does however, recognize I have one plugged in, because it still shows LIVE 4 on the command line. Even this will show up as LIVE 2 sometimes. If I unplug/plug USB it will automatically recognize the license and display LIVE 4 again.
If I let the console sit for a few minutes, it will finally recognize the control surface and everything starts working again. I've uninstalled/reinstalled .604 thinking it was a driver issue but that didn't fix the problem. Once everything starts working, it stays working and I don't have any issues.
When everything is non-functional i can start Console Tester and all of the faders and programming buttons test fine in the tester