boins,
this is beta of course, yet that's why the creator is requesting for feedback isn't it .
few more things,

consider adding a progress bar,
the tests are set to 105.000 figures yet they reach higher,
~110,000 for PI test and ~240,000 for the FP one.

2nd,
the FP test manages to create that access violation on some occasions,
try playing with it a bit, tap the core option and start it, or try any other variation, maybe u'll be able to catch it .

then try posting the end product at the bench forum when u finish with it and ask more people to feedback & test it .