Hi Mark,
Just a hunch in view of the fact it is a "Registration" page....
The problem could be due to a bug in K-Meleon whereby if you tell it to remember more than one username/password for a site, K-Meleon will crash next time you visit the site.
See
http://kmeleonbrowser.org/forum/read.php?f=1&i=2857&t=2851
Hope this helps.