trac tags stopped working with 0.11 trunk

[alex@…]

sometime after r6100 of trac trunk (0.11) my tractags plugin stopped working, when I click on the tags tab at the top of the page (trac nav bar)

I get the following error:

Oops…
Trac detected an internal error:
HTMLParseError: malformed start tag, at line 120, column 2


Python Traceback

Most recent call last:
File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6128-py2.4.egg/trac/web/main.py", line 386, in dispatch_request dispatcher.dispatch(req)
File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6128-py2.4.egg/trac/web/main.py", line 204, in dispatch req.display(template, content_type or 'text/html')
File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6128-py2.4.egg/trac/web/api.py", line 312, in display data = self.hdf.render(template, form_token)
File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6128-py2.4.egg/trac/web/clearsilver.py", line 310, in render injector.feed(template.render())
File "HTMLParser.py", line 108, in feedFile "HTMLParser.py", line 148, in goaheadFile "HTMLParser.py", line 226, in parse_starttag
File "HTMLParser.py", line 301, in check_for_whole_start_tagFile "HTMLParser.py", line 115, in error

System Information:

User Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; de-de) AppleWebKit/522.11.1 (KHTML, like Gecko) Version/3.0.3 Safari/522.12.1

Trac:	0.11dev-r6128
Python:	2.4.4 (#1, Apr 5 2007, 20:09:06) [GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)]
setuptools:	0.6c3
MySQL:	server: "5.0.32-Debian_7etch1-log", client: "5.0.32", thread-safe: 0
MySQLdb:	1.2.1_p2
Genshi:	0.5dev-r756
Pygments:	
Subversion:	1.4.2 (r22196)
jQuery:	1.1.3.1

The exact same error happens on another trac project runnig on a completely different system (OSX) So it appeared at the same revision of trac trunk, therefore it ought to be one of the changes made since...r6050 ?