This is what it looks like on my GUI, which I think is the XXL Rack Edition.

It's only affecting the EFECTS ON/OFF button.
All other buttons still behave with that same very little change in color, but they either:
- don't need to display a specific state (you just press to open a menu / call a function)
- they show a different text when clicked (the CC button)
edit: actually I just saw there are a couple buttons in EDIT mode (such as the PP button) which could have benefitted of the same treatment, but at least the most important one in the main screen seems fixed :/
