I’ve got a system setup which uses Firefox on an Ubuntu machine, with the Selenium RC server (remote control). I had a set of scripts which would run automatically every 15 minutes, which would prompt Firefox to open and go to the site and submit certain forms. This stopped working after I ran an update on some packages in my Ubuntu machine (9.04 Jaunty).

I was able to resolve this issue by upgrading from Selenium RC 1.0.1 to 1.0.3.