To reproduce this, simply use a keyboard with faders/knobs/modulation wheel etc. Map a few functions to some of the notes and then go switch between them. Now use a fader or the modulation wheel. You wont be able to make any changes, and if you use a flash key it's now locked on until you tap it twice.
Using Mac OS X, Alesis QX49. I've tested the keyboard in other software and it behaves as i'd expect. QLC+ 4.6.1.
MIDI - Note changes do not update while control change is being used
Any updates on this matter? I have been testing it a lot. I've tried multiple controllers across multiple channels with no luck. It's very upsetting. Will try the Windows version