Thread:Project:Support desk/Edit toolbar's gone missing

I just installed MediaWiki and I enabled the editing toolbar as well as the Advanced Editor. After editing my wiki for several hours, the toolbar just magically disappeared and I have no idea why! Now it's just a plain text-box.

I miss my editing functions, do you know what might have gone wrong?

Config details

 * MediaWiki 1.19.7
 * PHP 5.2.17 (apache2handler)
 * MySQL 5.1.57