Can't multiply but can mpf_str_out?!

[Ronald Bruck]

Before filing a more thorough report, has anyone had experience with 
situations where you can otherwise manipulate objects of type mpf_t, 
EXCEPT you can't multiply them?

For example, I have a couple of variables (parts of matrices) which I 
can print--they look completely normal; can add--but--can't multiply? 
Their exponent range is quite normal.

Usually these problems are my own mistakes, and I find them; an array 
overrunning its bounds, a variable which I init twice, or clear 
twice.  But this one looks different.

Another question:  are there problems with clearing large numbers of 
mpf_t's at a time?  I have matrix allocation routines (basically 
using the mechanism of Numerical Recipes, in which you 
increment/decrement pointers so you don't have to use vectors [0..n] 
or matrices [0..n, 0..m] but can use arbitrary intervals).  But when 
I go in to clear the mpf_t's, it crashes.  And usually in such a way 
that backtrace shows a corrupted stack.  But when I examine the 
memory addresses, they're where theys should be.  (Again, it could be 
another array overrunning its bounds.)

As I said, I'll try to isolate the problem from the rest of the 
program and post a more formal question.  But are there reports of 
problems with the memory allocation routines?  (I give it a 95% 
chance the problem is mine.)

--Ron Bruck