The Pie Chart requires services from the MathLib library. Some handhelds, like the Tungsten E, do not have this library installed by default. The library can be downloaded from http://www.radiks.net/~rhuebner/mathlib.zip.
MathLib is not part of this application and you are not paying anything for its use; a copy is simply included with this product download for your convenience. The MathLib.PRC is included in the file MathLib.zip that is part of the Quanto download.