Hey guys....
Thanks for the tips & advice - greatly appreciated!
Yes, have latest drivers for audio hardware.
I'm sure jBridge is running the VSTi - when I go to synth properties and the synth comes up, the bottom of the synth window has a bar for jBridge.

What I DID achieve success with is, I installed the 32-bit version of Sonar X2 (and patched with X2a).
I was able to open the project file that was giving me trouble in x64 directly, and, I had no problems! The CPU bars were going pretty crazy, and there were a couple dropouts during playback, but ZERO CRASHES!!!! Woo-hoo!!


I will try alternate (older) drivers just for the heck of it and see what happens in X2a x64, and make sure BitBridge is off, and see if I can get the 32-bit VSTi's to behave in X2a x64 (and report on that...)

Thanks guys!!!

Try building a new project with your new "kit"...

I.E with the updates (X2a) and Jbridge but with the same plugs and synths but from scratch...

I bet you dont get any dropouts...

I have had some nasty issues opening crossplatform backward compatible projects but once you get into a new workflow/environment it settles down (well, it did for me)

Good luck anyway! and Happy Caking!

Im wondering if I should upgrade to more than 4 gb ram using x64. but because of all the issues with bitbridge and stuff i´m afraid I will keep x32 with minimum ram, that was my doubt on my post a few minutes ago.

I installed W7 x32, and Sonar X2 x32 and issues are (nearly) totally gone. I only have 2 gb ram, my issues now are droputs when my projects have more and more synths, latency problems while recording midi, and a bunch of strange things like not loading my presets, im confused about what to do...
 

JPPG - First step is to absolutely increase your RAM to 4GB (although all of it won't be seen by 32-bit OS) Still worth doing.

I´ll take ur advise, will improve to 4 gb for now and keep x32 with 4 gb. I know 2 gb its not enough, thanks I was thinking that maybe from 2 to 4 it´s not even worth it in projects full of vst.

I went through the same crap for about 6 months till I got tired of losing my effing work.
Jbridge and Bitbridge are both basically worthless.  They have only worked flawlessly with a very small handful of 32-bit vst's, in my experience.
I know it sucks, but your gonna have to cut the 32-bit string if you don't want to lose work and reboot your pc every time Sonar crashes.  
End Of Story.