Getting a 'This workbook contains one or more links that could not be updated'
error when opening a particular worksheet? Even if the links status is "OK" when you try to update it manually?
The broken link error might be "hidden" in "named range" that was in a other spreadsheet, then moved, copied over or deleted. This tends to happen a lot if you use Names (either by typing directly in the box left of the formula bar or using Menu: INSERT>NAME>DEFINE&) and have merged sheets for different workbooks into one.
Save a backup, just in case... and run this VBA code to clean up then Names Collection of the workbook:
Dim nm As Name
For Each nm In ActiveWorkbook.Names
If nm.RefersTo Like "*REF!*" Then
MsgBox nm.Name & " " & nm.RefersTo