11.86; Vertical bars and fontification

Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.

(System info below.) 

Apologies if it is a config error at my end, but I've done a fair share of searching, and I can't find anything.
The only thing I have out of the ordinary is (I think)

 '(LaTeX-babel-hyphen-after-hyphen nil)
 '(LaTeX-verbatim-environments (quote ("verbatim" "verbatim*" "vcode")))

In a nutshell,

\documentclass{article}

\begin{document}
\begin{tabular}{|c|c|}%|

\end{tabular}
\end{document}

I'm getting this fontified as if the vertical bars were delimiting verbatim text. If I leave off the %|, I get
the rest of the file fontified to Courier which quite counterproductive (or was, until I found the
workaround). 

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