GarageBand panning track hard right by itself
I have GarageBand 10.4.2 running on a late 2015 iMac (running OSX 11.2.1)
It has mostly been fine because I do very little else on the Mac, but recently it has started acting up with a really annoying glitch. If I have a track highlighted (because I am recording, or editing it), GarageBand will suddenly pan the track hard right. I'll move it back, but seconds later it's panned hard right again. If a track is not currently highlighted, nothing happens to the pan position and I have no automation turned on. It it happening on older projects and brand new projects. Any thoughts on what is causing this hard right pan (it's always hard right to +62)?
iMac 21.5″, macOS 11.2