shot in the dark...
that aja thing is fw800... the wd drives too ?
sometimes fw800 gets "confused" when more than one fw800 device is hooked up to one fw800 'chip'...like if you have 2 fw800 ports on one card with one chip on that card, sometimes the computer gets confused..
try making sure your drive you're ingesting from is the only thing on your fw chip ...
people have had this problem in past so who knows.. might help..
edit: am assuming you still haven't been able to move file from macdrive to internal win drive