Suchen:

Your attachment (Anhang 759) doesn't exist. Attachments must be uploaded before you can post them.

Apparently something didn't work during the installation. Apparently there is something missing. ...

Also emptied the shop cache in the admin area? Shop >>> Toolbox >>> Cache
If necessary empty cache/ and templates_c/ via FTP (except .htaccess and index.html)
Then empty the browser cache again....

Einmal den Browsercache leeren!?
Ansonsten das Problem bitte etwas genauer beschreiben!