really don't wana hijack this thread at all but I have raised this question elsewhere and with Richard without response. You mention using the catalyst as a switcher.. I have been doin the same as of late with the AS cards and am still having some frame loss issues similar to those with black magic. its a late model macpro etc. Perhaps sourcechild would entertain speaking about his experience via pm so as not to hijack? Would really like to know if this should be happening. I am also interested in this thread topic.. looking forward to seeing where it goes.. thanks