I'm sorry to hear that you are having trouble with it. I must say it doesn't seem the application ever really caught on much, so you may be one of a small handful of users.
The first thing to do is go and make a copy of and backup the data files with all of your items and data.
SO go and copy (zip) the entire directory of "C:\Users\USERNAME\Documents\DonationCoder\PointMotivator" and put that copy someplace safe.
Ok so now there are two things for us to look at, the "PointMotivator.ini" file which is all your generic settings.
And the "UserItemDefs\myitems.itemxml" file which contains all your created items and data.
If you have nothing sensitive you could email those to me to have a look (firstname.lastname@example.org
If there are sensitive items, you could just open those files in a text editor and see if you spot anything unusual.
You could (after having made a backup!) try exiting the program and deleting your PointMotivator.ini file and restarting, to see if the problem was just a weird setting that got corrupted.
If that doesn't solve it then hopefully it's just a matter of some item in the xml file got a value that is triggering a bug and we can track it down and fix it.
The worst case scenario would be if your myitems.xml file got completely corrupted or erased somehow, so that would be the other thing you can check in a text editor.