Links don't update immediately when source is an unc path

I have two spreadsheets. This one (PTRates.xls) is linked to this one (NewRates.xls).  As long as the source is designated as a drive letter, when I make a change in NewRates.xls, it IMMEDIATELY shows up in PTRates.xls (well, as soon as I leave the cell).  
So far, so good.  
The problem is that there are multiple users viewing PTRates.xls and they have different drive letter mappings.  I solved that by putting in the full unc path as the link source (\\server1\vol1\user\home\NewRates.xls).  
Okay - here's my question: Now when changes are made in NewRates.xls they don't show in PTRates.xls until NewRates is SAVED (Not just leaving the cell) AND not until PTRates.xls is reopened.
Calculation is set to automatic. Pressing F9(Calc Now) does NOT refresh the data.
Anyone have any ideas why the instantaneous update quit and how I can get it back - other than the drive letter of course - since the user's drives are mapped differently.
Thanks.

P.S.  We are using Excel 2003
PittsfordAsked:
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jppintoCommented:
Please check Tools-Options-Calculation tab-Update remote references if it's checked...
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jppintoCommented:
Also try:

Edit >Links >Update Values

Can you also check on Edit-Links if the links displayed are valid?

jppinto
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jppintoCommented:
I don't have Excel 2003 here anymore so I'm "guessing" the location of things on the menu's... :)
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PittsfordAuthor Commented:
Tools-Options-Update remote references IS checked.
Edit-Links-Update Values does work - guess I could put a button on the spreadsheet to a macro.  Why doesn't it run immediately anymore?  Why should changing from a drive letter to an unc path cahnge the functionality?
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PittsfordAuthor Commented:
Well, I SHOULD say Edit-Links-Update Values works but ONLY IF NewRates.xls is saved first.  Didn't have to save the spreadsheet before - just move out of the cell.  Strange!
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PittsfordAuthor Commented:
I put a drive source for one cell in PTRates.xls and a full unc path source for another cell in PTRates.
The one with the drive letter (A3) changes as soon as I leave the cell.  The other one (A5) doesn't update (not even with Edit-Links-Update Values until I save the NewRates spreadsheet.
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PittsfordAuthor Commented:
OK - maybe this will give someone a clue - With the two sources in the PTRates.xls file, Under "status" - the drive letter source has "Source is open".  The unc source (under status) says OK
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PittsfordAuthor Commented:
I am giving up on this as there haven't been any more ideas.  I will put macro buttons on the spreadsheets and go from there.  Not the solution I wanted - but I guess it will work.  Thanks
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PittsfordAuthor Commented:
I didn't get any real answer from anyone else.  Guess they gave up on it too.
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