I made a math program as a project for my Java class, but I've suddenly
run into problems. The program runs perfectly in Eclipse, but when I
export it as a .jar, the program will run almost perfectly, but not
quite; there are some math problems that aren't displayed. I've used
both Eclipse's .jar exporter and the fatjar plugin, but both produce
.jar's with the same problem. Does anyone know what is wrong? I
appreciate any help.

You can download the programs .jar w/source code at:
http://www.kerensky.tierranet.com/temp/euclid.jar

Also:
The specific math problems that aren't working are the Surface Area and
Volume: Rectangular Rectangle, Right Circular Cylinder, and Right
Pyramid.

This isn't a case with jar's inside of jar's.

I've tried the eclipse.exe -clean command already.

I've uninstalled and then reinstalled the Java 5.0 JDK already.