First of all, this is as good a place as any to ask questions, at any level. We will try to respond as quickly as possible to any queries, complaints, suggestions, etc.
As for bug reports, the MathPiper site has an Issues page: http://code.google.com/p/mathpiper/issues/list
where you can report any bugs you find. We are continually working to close old bugs, but new ones keep getting found! That's good -- it's how open source is supposed to work. Don't hesitate to report something if it appears to you to be a bug. If you are right, you will be contributing to the improvement of the Project. If you are not right, no offense will be taken, and we will try to explain what was going on.