Yes, I know! This topic has been appearing numerous time, but that's probably also the reason that it's a hard issue to deal with it ...
I've been reading the manual also numerous times, specifically page 17 about that lock button. If you press and hold the lock button all locked modules will be lit. All non-locked modules remain unlit. So pressing those unlit buttons while holding the lock button will unlock individual modules....! No way!
The next try is to remember which modules you entered last. And that's also the problem. which was or were they again? So what remains is pressing an holding....pressing and holding until you get tired....and must get ready to pack for a gig...and have to leave this lit button.
Isn't there a more simple way to get this problem solved? Because even after restarting I can't put out the light...