Hi Lokasenna,
Thank you for helping me.
I am not sure with which pre-release version of Reaper Theory Helper still worked for me
I currently switched over to your Chord Helper script, which luckily enough, still works under Reaper 5.50 rc22 - 64bit. (mac).
I know this is "not your fault"
Just weird that a script (in this case your Theory helper) stops working correctly after updating Reaper.
Would like to know how this can be possible..just curious.
Maybe, indeed, this is a mac issue.
That left aside, it's still really annoying.