Buttons light up but do not change screen to adjust settings. Any thoughts?
Also same for Percussion, Brass etc.
Are you talking about buttons in HW controllers?
At least for the case of mixer button, it seems normal to me. Mixer is something you have in Maschine software, not in Kontakt
Performance should be for the scale/chord/arpeggiator mode, which are also not in Kontakt. If you want to use them, you must use Komplete Kontrol software (free) which will load Kontakt within itself but also introduce these functions
@REM Any updates? More info and a more detailed description of the issue would be helpful here.