Bought an SSD and upgraded to Cubase 6.5 and decided to try and go as 64bit as I could.
Cubases 32/64 bit VST Bridge has improved greatly, I didn't even have to use JBridge. Soundtoys mix bundle even seems to be more stable than it was under JBridge. CSR also works just fine.
Edit: Also -Miroslav Philharmonik CE is working fine and so are my Abbey Road, Flux & IRCam plugs.
2nd Edit: I just installed the latest soundcard drivers and have spent the last 4 hours trying to get ANY sound out - Karma for being so smug, I guess! If it ain't broke...