I was trying to install Robert Plank’s Action PopUp plugin on a WordPress MU blog today. The plugin would activate, but when I tried to update any of its settings, I would get an error message:

Error! Options page not found.

At first I wondered if the plugin was not compatible with the 2.7 version of WordPress, but it seemed to work fine on one of my vanilla WordPress 2.7 installations. Must be an MU problem. (more…)