Am I missing something? The OP says that audio "keeps moving out of synch." His description seems to indicate that it only moves out of synch one time, at the end of the recording.
The symptom is different if what is happening is that:
1.the entire audio track shifts ahead or backward along the timeline (the direction of the shift is important), without changing the relative note to note relationship, 
than if
2.the track timing drifts continually from a steady beat.
 
1. Suggests delay compensation error, which may be quite long if a plugin is reporting a long delay.
2. Suggests a clocking issue. 

For the Dim Pro and Rapture issue try a full reset and rescan of plugins:
 
http://www.cakewalk.com/Support/Knowledge-Base/2007013315/SONAR-X3-Full-VST-Rescan-Recommended-for-Upgraders
 
The knowledge base article was written for X3, but is still applicable to the current release.

Yes I believe it was a timing issue and a latency one too! Seems to be working now I deleted the audio track and made a new one put the WAV back into it and tried recording. It worked but it was a bit touch and go however I changed my settings and upped the latency. So it seems to be OK not a fix but working.
 
 

I'll second the suggestion to let Sonar recreate the AUD.INI file. Just move the original someplace safe after you shutdown Sonar, then restart. If it does not make any improvements, you can always put the old one back.
 
Regards,
Dan

Make sure to disable any "look ahead" plug ins while tracking. 
I bypass ALL my effects while tracking. 
 
And do run the audio loopback test. Your audio drivers would be to blame if the timing offset goes off. Make sure your drivers are up to date etc. 
Also check for DPCL issues. Background processes can also bring a stable system to it's knees. 
Example, I installed Dropbox the other day so I could share files... bad move. Even with internet disabled it was spiking DPCL big time.