JDF works OK...so far. We use JDF out of Preps as well. It seems that I have seen that issue once before. To fix, I believe I had to delete all jdf files, markers folder, job and create another JDF. We create 10-15 JDF impositions a day. Does this problem arise on every JDF or just this one?
My issues have been with prepress gateway, route gateway, and RIP gateway when proofing. My prepress gateway is used to vectorize fonts before any RIP (proof or 1-bitt's). This crashes the gateway. Every time. RIP Gateway will not proof spot colors correctly going to my Epson. Library errors. Route Gateway wont work at all.
RIP gateway is an improvement as I have had some PDF's with MEGA complicated transparency effects, etc, just choke the RIP gateway in v.3. V.4 chews right through.
I think I may be isolated with these issues as I cannot get Tech support to reproduce my errors. Next will try deleting preferences, data folders, canvases, etc. and starting again.
I'll post my results....to the other three Odystar users on the planet who may be interested.