Rob, first of all, NewBlue Titler is definitely available in 64-bit. I've been testing in both 32-bit and 64-bit for a few months now. When installing, please make sure you choose both the 32-bit and 64-bit version. It does use OpenFX in Vegas Pro 11.
As for any crashes, it would be helpful if you started a help ticket on NewBlueFX.com and listed your system specs. There are some issues with the Intel built-in video cards but, otherwise, it's working great on all of our systems.