OK, I figured out what was going on. Google enough and read enough and the light goes on finally.
The problem was not the "require_once" but a scoping problem. Specifically, I was calling "require_once" /from within a function/.
Bad! Bad! Bad!
The included source file was also including other files... thus the global class instance was just fine... it was simply hidden due to scoping rules.
Yikes! I was really pulling my hair out when entire global functions were "disappearing" due to the screwed up scope.
I finally figured out the problem in the "User Contributed Notes" section of the PHP manual (http://www.php.net/language.variables.scope).
THANK YOU again...
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