bpieber on "Cannot add martinaornets as editor"

I have invited the user martinaornets to my private blog dynameo.at as an editor. She does not get an invitation e-mail. I resent the invitation several times without success.

The strange thing is that she can log into dynamo.at. However, she cannot write new articles. She can comment on articles. She is not listed as a user of my blog.

Any help would be greatly appreciated.