I've just updated my Benq to LT-Plus 1.1 today and it's having a bit of trouble. I was playing a backup game earlier (with LT Plus) and it was working fine. Updated the firmware and tried to go back to playing the game, but it won't read this backup disk anymore - just tries to read for a while, then says 'Open Tray'.
It's obviously not the drive or the media I'm using because a) they're the same drive and media I was using this morning and it was working and

I've since flashed back to LT Plus and it's working again.
I've got another Benq drive from a 3RL console and tried that one as well - the results are the same. It will play the game from this morning if it has LT Plus firmware, but not if it has LT Plus 1.1 firmware.
I've tried about 5 other backups as well - they all work with either firmware. So far it's only one game that I'm having problems with, but I'm going to work my way through my other backups and see if there are any others it has problems with.