Update Links not working on opening

I have 3 workbooks tied together with links. One is a source only, the other
two push and pull data.
One of the sources, Payroll Master, on opening updates all links fine EXCEPT
to the third workbook (which is in the next directory up). Every time I open
it it prompts me to show it where the Payroll Entry is. If I hit cancel and
do Edit Links, I can change it there, but will still lose it upon closing
(the link appears in the box and looks ok, just won't update...)