zooterman:
TEMPORARY SOLUTION (BUT A SOLUTION NONETHELESS).
This worked for me: Open new empty project and import tracks from the problem project into this new empty one. I did all my tracks in one hit, but if it is indeed a plugin causing this, you may want to undertake a careful strategic approach to importing a few tracks at a time.
I say temporary solution because it makes no sense, technically I didn’t remove and ‘problematic’ plugin or anything of that sort, and it may well strike again. Who knows when.
Edit 2: I have now discovered that this is because FX channels are not supported through the ‘import tracks’ feature.
Yes, at this time unfortunately you can only import actual tracks, not groups or FX. But it’s a workaround that shouldn’t have to happen, so let’s hope they are making this a major priority right now.