Thread:Project:Support desk/Upgrade from WM 1.15 to 1.20.3 - Cannot Access User Settings - Global default is invalid for field editfont/reply

I had to edit LocalSettings.php

No more $wgDefaultUserOptions as an array like this $wgDefaultUserOptions = array(       'searchNs4'   =>      1,        'showtoc' => 1        );

Instead use as follows $wgDefaultUserOptions['showtoc'] = 1;

Now it is working again.

Regards, Marcus