Function behaves differently in two PCs

[odiseus]

I have a table with projects. The start date is in cell A5 and the due date in cell D5.
I need to know if the dates were entered correctly, and if so how many days remain to the due date (or how many have passed since it).

I have this function (which usually works well):

 =IF(OR(D5<a5,d5=a5),"error in="" dates",if(((days360(today(),d5))<0),(d5-today()),(days360(today(),d5))))[="" code]


Strangely on two PCs it provides the expected answers-but on another PC (running the same version of Excel 2007) the third evaluation returns an error #VALUE!
 
When I try to debug the error I get: 

[B]Reference: SheetA!$E$5[/B]

[B]IF(FALSE,#NA,IF(((DAYS360(41126, ”15/8/12”))<0),(D5-TODAY()),(DAYS360(TODAY(),D5))))[/B]
[B]The next evaluation will results in an error.[/B]

Any idea what could cause this?
Suggestions to make the function more robust will be highly appreciated.</a5,d5=a5),"error>

 

[odiseus]

Looks like I am having trouble with the code. It should read:
"=IF(OR(D5<A5,D5=A5),"Error in Dates",IF(((DAYS360(TODAY(),D5))<0),(D5-TODAY()),(DAYS360(TODAY(),D5))))"<a5,d5=a5),"error in="" dates",if(((days360(today(),d5))<0),(d5-today()),(days360(today(),d5))))<="" html=""></a5,d5=a5),"error>