Lee:
I suggest that there is an o/s error after version2.0 that is causing this problem. I'm behind on updating, still running version 2.0 and there is no problem at all with controlling the live control screen.
First, the existence of a registration bank in a folder that has a problem will have absolutely no effect on the keyboard as only the values of the registration bank being loaded update the settings. However, loading a corrupted file may distort other settings within the o/s.
Stijn, sent me a registration that was demonstrating the behavior you describe, and it opened properly on my Genos. I duplicated this registration (in YRM), and set each with a different live control screen and each operated correctly.
The usual response in settings on the keyboard is to leave the previous settings unchanged if a registration doesn't contain a particular group. That is why when you open a bank/button that contains a Song (MIDI or audio), that song will remain on the screen until you select a registration with a different song, and will be memorized in a subsequent registration (where you didn't want it) if song is checked.
So further testing revealed that the live control screen on my version of the o/s will stay at the last setting when a registration is opened that doesn't contain live control, it didn't revert to knob.
If the coding of the registration file is any example of the rest of the programming of the Genos o/s, there is lots of opportunity to create errors, and this is likely one of them.
Cheers,
Murray