Unread messages are showing up as:

 \003cb\u003eBlah blah

The first part is an escaped form of a <b>

The code currently has:

  s = s.replace("\\u003cb\\>", b) 

So that needs to be fixed up to deal with the escaped '>' as well.

I've also seen some other escapes ... I think parentheses. So it
would be worth experimenting a bit with sending mail messages with
special characters. Need to be careful not to let people write
general markup in a mail header and have that get passed through
to GMarkup.