[MAC] LiquidMix won't work in 64bit

I just upgraded to Cubase 6 on my Mac Pro 10.6.6 and have a problem with the LiquidMix it crashes in 64bit, uses all CPU power (also with 1024 buffers). Focusrite aren’t willing to write a updated plugin for 64bit.
No problem in the 32bit version of Cubase, so it can be 2 things. VSTBridge bug? Focusrite bug?
Who else is using this?

Soundcard is a MR816x…