never had that problem but i'd try the following to isolate the problem:
- render out a simple test comp at same resolution and same codec and same file location
if it works, there could be a problem with your final script.
- render out your final script to another location (ie local hard disk)
if it works, it's probably a network issue.
- render out your final script in HD to some other codec
if it works, it's prolly (duh)... the codec
if all of the above doesnt help and you're under a deadline, render out a image sequence and combine them to a quicktime file of choice in QTpro or FCP.
btw, anybody knows if there's still a conflict between the blackmagic and the apple 4:2:2 10bit codec?
if yes, it might help to uninstall one of them (preferably the blacmagic if you dont need the 10bit RGB one) or get the latest codecs from their website.
++ christoph ++