Thread:Talk:MediaWiki 1.19/Fehler beim Erstellen des Vorschaubildes: Die Miniaturansicht konnte nicht am vorgesehenen Ort gespeichert werden/reply (2)

I thought this problem from 1.19 had been fixed in 1.20, but yours is the second report of this in 1.20. In the meantime, can you set $wgUploadDirectory to an existing, writable directory?