Tried again, this time on a Debian/testing system:
$ python demo.py nuke
Trying to set up web server on port 8917 ... should be ok.
Server running - connect to:
    http://localhost:8917/demo/
1. Log in as "demo"/"demo" or "admin"/"admin".
2. Hit Control-C to stop the server.
3. Re-start the server by running "roundup-demo" again.
4. Re-initialise the server by running "roundup-demo nuke".

Demo tracker is set up to be accessed by localhost browser.  If you
run demo on a server host, please stop the demo, open file
"demo/config.ini" with your editor, change the host name in the "web"
option in section "[tracker]", save the file, then re-run the demo
program.


127.0.0.1 - - [06/Jul/2010 15:48:03] "GET /demo/ HTTP/1.1" 200 -
127.0.0.1 - - [06/Jul/2010 15:48:03] "GET /demo/@@file/style.css
HTTP/1.1" 200 -
127.0.0.1 - - [06/Jul/2010 15:48:15] "POST /demo/ HTTP/1.1" 302 -
127.0.0.1 - - [06/Jul/2010 15:48:15] "GET /demo/ HTTP/1.1" 200 -
127.0.0.1 - - [06/Jul/2010 15:48:18] "GET /demo/keyword?@template=item
HTTP/1.1" 200 -
127.0.0.1 - - [06/Jul/2010 15:48:25] "POST /demo/keyword HTTP/1.1" 500 -
$ python
Python 2.5.5 (r255:77872, Apr 21 2010, 08:44:16) 
[GCC 4.4.3] on linux2


With Python 2.6.5, it works ok.


Upp'ing the severity because this bug prevents users from upgrading to
this 1.4.14, and thus missing out on the security fixes.