X3c Problem unfreezing tracks

I have a project with 6 tracks froze. When unfreezing 3 are moving backwards 7 measures? I haven't seen this before, any ideas? I did a "save as" but that didn't help.

earlier. No tempo changes. All 3 are Amplitube, but another Amplitube is staying where it should.
 Exactly 7 measures.

Yeah, they are audio. All effects (including Amplitube are in the Pro-channel via an fx chain in Amplitubes case). I have to save resources with this project to keep my 128 buffer setting. I can't hardly play guitar with it any higher than that. It's strange...I haven't had this happen before.

When you unfreeze a clip it moves back to it's original unfrozen position.
If you've edited the frozen clip (trimmed,split, etc) those changes evaporate as well.
 
I recently learned in another thread that you can right click on the freeze icon and select to leave the FX Bin unfrozen (frozen track/unfrozen FX Bin - live effects). Even though it would used more CPU this option would have saved me some grief in a recent project where I had to rerecord a guitar track because I had rearranged a song (editing & moving frozen guitar tracks in the process) and then at mix wanted to change the amp model used in Pad Farm plug-in I had in the FX Bin.  
 
I haven't used this partial freezing yet in a full project; it might leave me with a CPU load that is too high for my wimpy processor on a big project. I might just have to get in the habit of making sure my tracks are unfrozen before I move or edit clips. Something new (for me at least) to experiment with.

i had one occasion lately where I had melodynized a clip and then wanted to freeze it and get a bounced clip, yet when doing so it moved immediately (without any user interaction) and this particular vocal line was completely out of sync with the rest of the song - when trying to export the mix as audio WAV the same happenend ...
 
i realized that the clip was located after a tempo change - and that apparently confused Sonar/Melodyne because after removing the tempo change (which was only possible since this was a creative session and we could simply ditch the part before the tempo change), it froze/bounced perfectly
 
meanwhile there was a melodyne upgrade with ARA improvements, but I have not had a similar situation since so I can't tell if the problem still persists ...