DeeringAmps : "If you loop that section, and punch multiple times (I'm sure that's what you're doing),
"Take 1" is fine, each successive take is late, and it gets worse and worse with each take. "

Since this is a looping bug, have you tried the "turn on the metronome but mute its bus" trick ?

This has solved other looping bugs, at least midi playback ones.

My metronome was on and sounding. Thanks for the suggestion though.