Working on the same project for a couple days.  When I close SONAR P I get this error message:
 
Exception thrown in destructor
(f:\dd\vctools\vc7libs\ship\atlmfc\src\mfc\winfrm.cpp:159)
Encountered an improper argument.
 
My F drive is an audio storage drive, but is not being used by this prjoect.  And there is no directory :\dd.
 
What does this all mean?

Any messages in your system's application log?  Should point to what is causing the problem
 
Glen

According to Google, the path + file referenced in the error message has occurred in multiple apps:
https://www.google.com/se...8&oe=utf-8#q=%22f:\dd\vctools\vc7libs\ship\atlmfc\src\mfc\winfrm.cpp%22
 
It looks like it might be Visual Studio related, though I'm not sure where in SONAR that might come into play.  Have you done any Windows updates recently?
 

Got the same problem just today but referring to cpp:137.