Question: Logic Beat Mapping problem
For a couple years now I have been using beat mapping to add software drum instruments(Ultrabeat and Addictive Drums) to live instrument sessions that were recorded without a metronome. I upgraded to Logic 10.4 from a pretty old version about a week ago. Since then, the audio from the virtual drum tracks is slowly but surely drifting gradually out of sync. Visually the MIDI track is still matched to the other tracks, but audibly by later in the song they are noticeably late and flamming. If I stop the session and restart from any point in the song, it is back in sync. Is this a bug or is there a setting that I can correct myself?
MacBook Pro, macOS High Sierra (10.13.3)