'Unhandled Exception' - Session keeps crashing. Why?

I've been having a problem with a project of mine. I've been trying to finish the arrangement of the song, but any time I clik on the timeline from the middle 8 to the end of the song, I get an Error - Unhandled Exception (Not Responding) sign and Sonar crashes. Not sure what the problem is. More specifically, it says:
 
Module C:\Program Files\Cakewalk\SONAR X3 Studio\SONARSTD.exe

Exception code: c0000005

I've tried rescuing the elements of the track (it's mostly midi and soft synth with a few bits of recorded audio in there), and recreating them in a new project in a different folder, but something must be messed up in either the audio, the midi clips, the soft synths (which all work pretty fine in my other sessions), or some combination of these. In case it is relevant, I should add that I'm working on this song as an administrator because there are two tracks which I'm using the Pentagon synth on.

What is it that is going wrong here and how can I rescue my work? It only seems to be affecting this one project.

PS All my error dump/send error report options never seem to work as far as them sending anything to Cakewalk.

Haven't applied any patches as far as I know. The Article you linked only has stuff for Sonar X1. Also, I don't use any of the soundcards they listed.
 
Thanks for the tip re  error sends. Won't bother any more.

Ok done. Installed and updated. The same session still crashes.