How to make parenthesis matching work in XEmacs?

I tried using all options in the menu setting Options|Display|Paren Highlighting, but nothing works - no parenthesis match is performed. I also tried 开发者_Python百科setting explicitly (paren-mode 'blink-paren t) in my init file, but that did not help either. Any ideas what may be happening and how do I fix it?

Thanks.

---

I have had paren mode working long enough in my XEmacs that I forget what exactly I did to turn it on, but I did dig these things out which might help.

From my .xemacs/init.el:

(require 'paren)

From my .xemacs/custom.el as part of custom-set-variables:

'(paren-mode (quote sexp) nil (paren))
'(show-paren-mode t)

-John