I don’t have a definitive answer for you. However, when working with multiple projects, Project is prone to such problems when the individual projects are in difernt folders. Try moving all the files into a single folder. If not, make sure the full path to the file is recorded for the link. If you’re not sure, try linking again as you did in a tempory file that you know works, then examine the exact path that Priject used – copy the link and try again.
