I am having the exact same problem. I have tried two different Windows Server installations on different instances in the Amazon EC2 cloud without success. Everything else is working and the Manager is available over the web. Connections are good according to attached image.
Problem 1
I can't share a project because the shared button is greyed out as above.
Problem 2
I can´t upload a library and I am experiencing the same result as B.E.A.T showed in his image above.
Unfortunately I cannot find any solution to these problems in the quoted articles
http://helpcenter.graphisoft.com/?p=40585
It is really important for me to solve this problem. Any suggestions?[/img]