Upgraded to CC, now no Ram Preview...

Hi All,

The title says it all. I see the ram preview on the external monitor through a BM Intensity Pro card,

but in the computer monitor, it sticks on the first frame, and kind of jitters, with the bounding bow flickering.

Any ideas? In fact, I get no real time playback at all any more. Everything worked fine in CS6.

HP x820

nvidia quadro 6000 + tesla

64 gigs ram.

Thanks in Advance

Simon