I use Opera to test my work. But after upgrading to Feisty Fawn, Opera didn’t seem to be working. When selected in the menu, nothing happened. I tried to start it from the terminal, but I got some error messages about problems opening the device.

It seems that upgrading Opera to the latest version did the trick. Just go to the Opera download site, download the latest version for Edgy and Feisty and install. I removed opera first before installing, so maybe you might have to do that too.