Sonar Platinum - Started off with a few issues... then.....

Crash
 
I was working with Melodyne correcting a few vocal clips in a verse. Had 4 takes and the first clip I corrected, a short phrase, I had split a word (read blob) into 4 smaller bits and manually dragged them to pitch, there were some expected artifacts, but when I hit cnt z to undo it went back to no melodyne at all....
 
tried it again same thing.  There some other odd things as well as I worked. then when I went to bounce all the clips I crashed.
 
When I re ran Sonar I then got an alert window...
 
Program Compatibility Assistant
Windows detected that this program did
not run correctly
To try and fix the problem, Windows has
applied compatibility setting to this
program. Windows will use these setting
the next time you run the program.
If you notice taht this program didn't run
correctly, try running the program again.
Program: SONARPLT.exe
 
Whatever it was... seemed ok for the next couple of hours... here's hoping :)