fonts not rendered correctly in menu after upgrade from 10.4 LTS to 10.10 beta

[Nick T]

Binary package hint: yelp

After upgrading from 10.4 LTS to 10.10, noticed problem with font display in yelp after selecting System|About Ubuntu.
See screenshot in file attachment
Font problem seems to only be in yelp. I've not noticed this in any other apps.
Problem the same when launching yelp from Alt-F2
Problem remains after power off and restart.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: yelp 2.30.1-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-21.31-generic 2.6.35.4
Uname: Linux 2.6.35-21-generic i686
Architecture: i386
Date: Thu Sep 16 21:06:51 2010
ExecutablePath: /usr/bin/yelp
ProcEnviron:
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: yelp