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Yes, it was the lack of a space around the operators.<BR>
<BR>
I missed this part of the README.variables:<BR>
<BR>
"The arguments and operands of the expression MUST BE separated <BR>
with spaces (take care NOT to leave ANY spaces between opening and closing <BR>
square brackets and the first and last arguments)."<BR>
<BR>
To which I might add this clarification/prolixity:<BR>
<BR>
"Caution- do not forget to separate the operators from the terms by<BR>
at least one space, or the result will be that the expression will silently<BR>
not resolve!"<BR>
<BR>
Many thanks to Jared Smith for his help!<BR>
<BR>
murf<BR>
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