Deleted social workspace is still displayed in the list 'Select a workspace'

As Administrator, I rejected a social workspace.$
As the social workspace creator, when i'm in the Collaboration tab, I still have the workspace displayed in the "Select a workspace" list. But when I click on it, it fails to display the workspace's dashboard.

The deleted workspace's documents are still displayed in the activity stream of the doc author and clickable. When I click on it, I'm displayed the document in the Document Management view. I can see it un the Collaboration view by clicking the icon. From this view, I can

• create a new article in the deleted workspace, which shouldn't be possible, since the workspace is deleted.
• click on Actions > Dashboard => I get an error.