I'm posting this here in the pre-release forum as I have no idea whether this is R4-specific or not...
Right now I am recording multi-take MIDI and I want to a add additional takes with additional recordings (i.e by restarting recording after it had been stopped) and now my problem is, that the previous take is being played back during recording.
I assume there must be some setting somewhere which affects this behaviour.
I had disabled it in the preferences and then forgotten all about it.
So it appears it is indeed beta-specific - and not the first time R4 messes with my preferences (I don't think it's possible that I accidentally altered it myelf).