Hey Guys,
 
I'm having so much trouble with Sonar 2017.7 (MIDI playback of synths consistently crashing the program) that I want to temporarily revert to 2017.6 and see where the problem actually lies. 
 
How do I do that?  System restore?  Thanks!
 
Win 8.1, i7, 3.5GHz, 16 GB, Yamaha controller, QuadCapture, MOTU MIDI, Event 8 monitors, Omnisphere, Sampletank/Philharmonik, AD2, Roland XV3080, Virtuoso 2000. Proteus 2000

Open up command center. Right click on sonar And choose roll back

I noticed the latest patch hindered my virtual synths and drums. It's unfortunate but currently trying to work through until the next patch. Thinking there's a bottle neck with virtual instruments but I'm not a debugger, good luck :)