Editor change causes serious trouble!!!

I (as Super User) switched the editor in my profil from TinyMCE to Code Mirror. This caused a warning:

Warning: array_keys() expects parameter 1 to be array, null given in \xampp\htdocs\schaubar\plugins\system\flexisystem\flexisystem.php on line 108

Then the Joomla layout was very corrupted: All system icons were invisible (save - save and close - ...). So it was impossible to switched back to TinyMCE in the Joomla backend. So I changed it with phpMyadmin.

Now the warning message is gone and Joomla looks ok but - very strange ! - in the "User"-Screen the buttons "save" and "save & close" does not work. So it is impossile to change user profiles or create new users. And - even stranger! - when I change user profiles with phpMyadmin ("editor":"CodeMirror" again to reproduce the error) theses changes are not shown within Joomla.

: So my Joomla installation is corrupted!?! Or can I correct it? Which file is affected? :

I'm using Joomla 1.7 with com_flexicontent_v2.0_beta3_r907.

Please post in the thread of flexicontent v2.0 beta. The plugin is incomplete, for now try using the other editor if it works