Thanks for the replies!
It doesnt print at all, sometimes it will even cause a 'fatal error' with autocad. Everyone in our office has the same problem, so its a strange one - thought it must have been a common problem. It is an intermitent problem though, not consistant at all.
We are using 2005 at the moment, i have a copy of 2006 as well so i might try it on that and see what happens.