Hi!
When re-assigning PL-10 functions after a BUS change that removes the possible assignment of a PL-10 button (for example, initially assigned to mute a MONO Aux, which is removed in a BUS change), you have to re-assign the button to a valid function, apply, and only then can you remove any assignment and return the button to ‘unused.’
Or am I wrong?
www.pianojam.nl
Hey!
What do you mean with a BUS change?
Frank
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IDR32, PL10, Dell Latitute XT tablet
Our adventures with this setup: https://gonnagles-engineering.blogspot.com
Hi Guy
We have replicated this issue and it will be fixed in a future firmware release. Well Spotted! 
Regards
Sam A&H
Frank: I mean that when I’m going from Utrecht Centraal to Nieuwegein, I need to change from number 77 to …
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No, I mean any change in the routing in the mixer: for example, you might re-balance the number of Mono and Stereo Aux’s. Another ‘BUS’ change (at least in my eyes) would be re-allocating the physical outputs from one source to another.
Guy
www.pianojam.nl