Today, we decided to clean up our system and delete plug-ins and components we no longer use. After deleting one plug-in that enhances the functionality of the editor, we received the message that the component uninstall went wrong: SQL error or missing or unreadable SQL file. DB function reports no error. Uninstall Component Error (see below)
We just ignored that and went on deleting other old plug-ins. Once we were done cleaning up the system, we wanted to write a new article and suddenly we got a very strange error. We saw some of the editor and underneath the following error: Fatal error: Call to undefined method stdClass::onDisplay() in .../public_html/libraries/joomla/html/editor.php on line 261.
Apparently, the component that was not fully removed caused a problem - the message referred to editor.php on line 261 so we knew it was related to the editor.
Checking out the forums did not really give us a clear answer. Some suggested to completely reinstall Joomla, others suggested that we needed to hack the code - things we did not want to do. Fortunately we knew which component was not fully removed from the system.
Our fix to the problem is perhaps as simple as what caused the problem: Just reinstall the component and your editor should work again. We could replicate the fix on the production site and our backup that runs on WAMP on our home computer and it works. Please leave a note in the comment system if it also works for you.