I am using Firefox 3.6.24 on Debian Linux, cache has been cleared and browser has been restarted
In my WordPress user profile, "Disable the visual editor when writing" is NOT checked
Web server is running Apache, no errors are being logged
I tried "Removing Settings" from the plugin settings, adding the "Clean Code" button,and re-saving - same issue
Plugin was installed automatically by way of regular FTP, logged in as an FTP user with full access to the directories