It's not a hard lock, the system is still 'usable' in that I can click on things and use the keyboard; but I cannot shut down, restart, log into another user, or kill the IMGBurn process. Guess a more apt word would be hang instead of lock. I will edit for clarity.
Also, I can cycle the tray, it is not locked; but this does not change the state of the program, even if I remove the disc and close the tray.
Yes, I have the INF update installed. I do not use Matrix Storage so I don't have MSM installed.
MLS