[D&D 3.5] Dreaded NaN Issue

So, this has happened a few times, but I don't know how to fix it. For some reason the base stats aren't working for me and I just get NaN as the total and the mod. This is happening to one of my players now as well. I'm going to attach a picture to help.

Which sheet are you using? Did you go through all your entry boxes to be sure they are all properly filled out such as a 0, a positive number (without the + sign), or a negative number (-1, -2, etc..)? Can you copy and post the error code also?

Here's a quote from the D&D 3.5 Character Sheet's author: Diana P said: The way the ability bonuses for the D&D 3.5 sheet are calculated now is a bit different than before; for all rows showing a NaN, try over-writing all the numbers in those rows (ie delete the existing zeros and replace them). Not sure why the system occasionally gets confused with the preset zeros, but it does. Hope this helps!