Like playing a guitar solo 10 bars early when there is clearly no audio in that part of the song.  Really strange!  Have muted and then played each track.  Yup the solo is coming from the lead guitar track.  Just that Sonar is playing it when it feels like and not when the audio track is clearly lined up.  

Anyone else seeing this?  Had this with X2 as well.

No, but I cannot speak for everyone else. Is is only one project?

Not seeing anything that spooky!

Scary!  Don't get me wrong.  Opens up all kinds of creative possibilities when your DAW takes control and decides to play whatever whenenver.

Seruiosly though, second song giving me this issue.

I could see that being very bothersome.

You're not tuning the guitar part with Melodyne by any chance, are you?  (It works really well for that sometimes, but it can cause audio to play back at unexpected times if you aren't careful.)