hi
As the Quark is not good at working on network, i suggest u to save a copy of document on ur computer,
then do all the changes and manupulation on that document when ur done with it then go and save it back to the network.
b'cos Quark is not so good at network,
In fact when u work on network it will slow down ur QuarkXPress working and it could hang also in between so best recommneded is to work on ur own computer and then save it back to the network
regards
minna677