CM>Actually, it turned out to be a very strange problem.  I was
 CM>calling a function long before this code is run, that assignes a
 CM>character to a variable defined as
 CM>        char Temp;

 CM>Well, if I simply recode this to be:
 CM>        char Temp[255];

 CM>The problem with sprintf many, many lines, of code, and several
 CM>functions later, disappears.

Sounds like sprintf is overwriting memory, and you're just accidentally
plopping some more memory in its path.  You're fixing the symptom
(probably only temporarily), not the problem.

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