Cannot add extension 'RDP-xxxx-xxxx-xxxx-xxxx-xxxx' with same name space 'Microsoft.Windows.Azure.Extensions' and type 'RDP' more than once.

Hi!
Im trying to create a RDP-user for a CloudService in Azure using the portal, but I keep getting the following error:
Cannot add extension 'RDP-xxxx-xxxx-xxxx-xxxx-xxxx' with same name space 'Microsoft.Windows.Azure.Extensions' and type 'RDP' more than once.

I have tried to create a new user with different username and password, I have tried to set the expire-date to different values and I have tried to do this all again in a different browser(IE)..

Has anyone been able to get this working?