I use the dontations module and it's working well. I got no errors on testing IPN and the Donat-o-meter block shows Left to go as a positive amount. If the donations exceed the goal it will change to read Surplus. I didn't like the word surplus as it implies that we have too much money! I changed it to read Over Goal By-
I am not sure why you are having that problem. You could try regenerating your templates.
Barry
Sweet Home, Oregon