Now I know when the mistake appears.

If i add a new "MyMediaGallery", i can add many albums, but if i do some changes in the MyMediaGallery-Settings, i can't add any new album...

And the settings cannot be responsible for it, because if I undo the settings, the bug stil exists.

So, what is the problem.

Info: I Use the "My Media Gallery 4.8"

Please create a new page and move the edit album into that page. Then go to the module settings and assign the page to the edit album page. Then it can work.