Lost HTML rendering in Gnus after update from Emacs 24.3.1 to 24.3.50

[N. Jackson]

I have updated Emacs from 24.3.1 [1] to 24.3.50 [2] and when viewing
HTML emails in Gnus, I am seeing just the raw HTML as if it were plain
text. In Emacs 24.3.1 the HTML would be crudely but readably rendered.

Is there something I need to configure to get HTML rendering working in
Emacs 24.3.50?

Thanks!

Regards, N.

[1] GNU Emacs 24.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.8.2)
 of 2013-08-14 on buildvm-15.phx2.fedoraproject.org Windowing system
distributor `Fedora Project', version 11.0.11404000 System Description:
Fedora release 19 (Schrödinger’s Cat)
 
[2] In GNU Emacs 24.3.50.2 (x86_64-unknown-linux-gnu, GTK+ Version
2.24.22)
 of 2014-02-10 on moondust Repository revision: 116400
michael.albinus@gmx.de-20140210135433-zh8yf8lhyrxg3n2o Windowing system
distributor `Fedora Project', version 11.0.11404000 System Description:
Fedora release 19 (Schrödinger’s Cat)