I've got a simple linked cell from one sheet to another, but upon
opening the worksheet which has the references, I get an error
message, "unable to read file". If I go to EditLinks, it shows
"Error: Source not found". But if I open the source file manually, it
updates the link. The reference worksheet will only update once I
open & close the source file for each of the Links.

Is there something I can look for to file out why this might be
occuring?