4
Well I seam to have fixed it on my own.
I changed
line 251 in localsettings.php
$wgFCKUseEditor = false; // When set to 'true' the FCKeditor is the default editor.
to
$wgFCKUseEditor = false; // When set to 'true' the FCKeditor is the default editor.
Solved my problem...