[Plugin: Article Directory] You do not have sufficient permissions to access this page

Hi,
after updating to 3.04 i get this error:

You do not have sufficient permissions to access this page

if i try to log in as Author. I can log in as Admin. It is no db Issue i checked that. Even if i add a new user (my new user get the role of subscriber) the same happens.

If i deactivate the Article Directory Plugin i can login as Author and Subscriber again.

I use your Plugin for a long time and never run in problems. The only special thing is tha i use WordPressMU.

You can test it here: Artikelverzeichnis

Hope you can give a advice to help.

Thank you very much in advance.