Can you try it out on the files given in tutorial section (so there is no issues in hiding files and other options) and we can clearly see your screen.
Ok I found out the root of the problem. (It was working correct all of a sudden)
Everything works fine - the problem just occures if i create an assembly after a custom batch add-in was working. I´ll see what´s causing it in detail.
Thank´s a lot for your help Deepak.