From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040312

Description of problem:
When performing an HDD upgrade install from test2 -> test3, clicking
the "Release Notes" button works fine but an error is output to VT1:

(releasenotes_viewer_gui.py:154):
Gtk-WARNING ** Unknown tag 'sub'.

The message is output 7 times consistently on VT1 for every click of
the button. It also repeats for other line numbers such as 7333. It
doesn't affect the functioning of the Release Notes window, but
nonetheless, it is unwanted output. 

Are these kinds of reports too fussy or unimportant to track in
Bugzilla? Because I've found other non-critical output similar to this
on VTs from the anaconda installer I will report on if wanted/needed. 

Version-Release number of selected component (if applicable):
anaconda-9.92-8

How reproducible:
Always

Steps to Reproduce:
1. start anaconda installer
2. press the "Release Notes" button
3. change to VT1 (Ctrl+Alt+F1) to see cosmetic bugs
    

Actual Results:  The output printed above was displayed.

Expected Results:  Tag 'sub' should be known and identified so that no
warnings are output.

Additional info: