When loading old projects that loaded fine a week ago, SONARPLT crashes ... sometimes.
When loading in safe mode and tapping through the plug-ins, I can load my projects (mostly).
it happened on multiple projects.
I rolled back to 2016.10: problem still there. Reinstalled 2016.11 now.
The one time I could not recover a project by loading it in safe mode, I got a Runtime Error R6025 "pure virtual call" (but did not log which plug-it it caused, next attempt went through ok).
 
With enough safe-mode attempts I could recover all projects so far. 
Not a show-stopper but something seems to be wrong in my setup.
 

Same problem here. Can't open any projects except when in safe mode. Strange, but when the project opens in safe mode all the plugins seem to be there and working? I did a system restore which brought me back to the Oct update (couldn't roll back through CCC, kept getting a message that Sonar was open when it wasn't) but still the same issue. Everything was fine before I went to the November update. 

Went to device manager and found that the on board audio device had been enabled. Disabled it and everything seems to be OK. Haven't gone back to the November release and will stay with the October release until the potential dust settles.

I could reproduce the problem by ...
- restart Windows
- start Sonar
- load project: failed, Sonar crashed
- restart Sonar
- load project in safe mode: ok
- restart Sonar
- load project: ok
 
my configuration: Sonar Platinum 2016.11, Z3TA+2, Rapture Pro, Komplete 9, EZ Drummer 2, Windows 10 x64, Intel i7-4770 @3.4GHz, 16GB, SSD 256GB, HD 1TB, Steinberg UR242 (ASIO)