tabbing between links in html posts

[Eric Abrahamsen <eric@ericabrahamsen.net>]

I'm still a bit confused about html rendering, etc. My
mm-html-text-renderer is set to gnus-w3m. I'm used to hitting 'h' to get
into the message and then TAB to move between links, RET to open them in
my external browser. With some messages I find that TAB moves me to an
underscore character in the buffer, where and and all further keystrokes
result in a "buffer is read-only" error, and I can't TAB on to the next
link.

I can't tell what's creating these underscore characters. In the most
recent message that had them, it looked like they might be part of an
html table rendering. That particular message only had an html
component, no plain text. Any hints in this direction? 

(probably unrelated oddness — hitting 'C-u g' to display the raw article
resulted in the article being instantly re-rendered, ie I couldn't see
the raw html. Choosing "Raw article (C-u g)" from the menu bar displayed
the raw html correctly).

Thanks!

This is No Gnus from a few days ago, and Emacs 23.2.1.

Eric