mpf_div changes value on a variable which doesn't participate in the division.

[Torbjorn Granlund]

I am afraid we cannot du much with reports of the type "my program does
not work, it must be a GMP bug".  It might be a GMP bug, but you need to
determine that, not us.

The way to proceed is to try to find a smaller program that exhibits the
problem.  Once you have a small example which still looks like it points
to a GMP bug, then please get back with a follow-up post to this list.

-- 
Torbjörn