Play, record and stop button will play sounds instead of triggering functions in EXISTING sessions

Hi,

before you link me the FAQ post regarding this problem: I've seen it. It doesn't answer my question.

Here's my issue: My Komplete S88 will trigger above mentioned functions just fine when working on a session for the first time. However, once I close Ableton and come back to it later, pressing the corresponding buttons will result in midi notes being played. The only solution to this I've found this far is reinstalling Komplete Kontrol. However, I don't want to do that every time I re-open an existing session.

Any help would be much appreciated.