Strange audio metronome behavior

This just started happening and I don't know if it's a setting that I unwittingly (or maybe nitwittingly) changed or if it's a bug. When I use the audio metronome to count in to add a new part, my existing MIDI tracks start playing shifted by the same number of measures as the count-in. In other words, after a 2 measure count-in my audio starts playing properly and 2 measures later the MIDI starts playing from the beginning, out of synch with the audio. Playback is fine and if I punch into record while playing it's fine. If I switch to a MIDI metronome, all works well also. I just loaded the X1c patch and that didn't help. It happens with both old and new projects. Any ideas? Thanks. Doug

I tried changing the driver mode after it started happening and it didn't help. Haven't changed or updated anything. The only thing I did recently (and I can't say for sure if the problem existed before) was to load and listen to some old Cakewalk Pro projects that I had backed up on CD. I can't see how that could have caused the problem; I've done this before with no problems. In fact, some of my current projects were started way back when with Cakewalk Pro. Now, even brand new projects exhibit the same problem. I have a feeling I may be reloading X1 from scratch.