Stop sharing option is not enabled

I'm testing the nightlies on quantal, ubuntuone-client-gnome 4.1+r18-48~quantal1

After sharing a folder from Nautilus, the stop sharing option remains disabled.

To reproduce:

Open the file browser.
Go to the Ubuntu One folder.
Create a folder inside the Ubuntu One folder and name it Folder to stop sharing from nautilus.
Wait for the file synchronization to complete.
Click the folder Folder to stop sharing from nautilus.
Select the menu option Edit > Ubuntu One > Share....
On the Share on Ubuntu One dialog, enter <email address hidden>.
Click the Add button.
On the Contact name field of the Add contact dialog, enter Test contact to stop sharing.
Click the Add button.
On the Share on Ubuntu One dialog, enter <email address hidden>.
Click the contact Test contact to stop sharing.
Click the Share button.
-> It's not possible to select the menu option Edit > Ubuntu One > Stop Sharing.