I'm getting a bizarre error with a named cell.
The first tab has three cells named SN WO & DC.
Three other tabs reference those cells directly: "=SN".
But a fourth tab can't see it. If I type "=SN" into a cell
Excel will popup a file browser expecting me
to find a file with that name.
If I copy a working "=SN" from another tab,
I get an error saying that name is already on this tab.
This particular tab was copied from another spreadsheet,
but this does not appear to be linked back to that spreadsheet.
Does anyone know what's going on here?

Mike Henry