Well, since you suggested it, I have.  This is my first time w/ this debugger, and I found that the program was ending in an output routine.  Mind you, this is about 115,000 sections before is should be doing any output!  I note that when I hover over the input arguments they don't have values, instead the ominous notation "undefined address."  This seems to suggest that the program is not entering the routine through the front door -- in fact the icon in the left column is a green arrow with the advisory that this is the next statement to be executed after returning from a call to some other function.  Meanwhile the output window is showing a fp overflow at an unknown address.  (sigh)