The latest beta includes a number of changes/fixes to bigfloat.

Bigfloat is now passing my 100+ unit tests.

Note that I have not had a chance to update $powmod() with your updated algorithm. This should be in the next beta.

This beta also does not include the /bigfloat -d switch yet as I would like to make sure bigfloat is stable first.

Please let me know how this beta works out for you.