FMLE3, Epiphan on win7 64bit giving green screen

I have a brand new Win 7 64bit machine with FMLE3 installed, along with Epihpan VGA drivers and app v3.22.2.

FMLE works normally with a DV video source. When I try to source from the Epiphan, the preview image shows up perfectly, but as soon as press Start, the video changes to a green screen. Captured fps drops to 0 and a blank file is recorded.

Any ideas? What could I do?

Cheers

Will