Unable to subscribe to shared content.

When trying to subscribe to shared content the following messages is shown:
You do not have the right to subscribe to your selections.

Currently the subscribe functionality has been disabled in Filr 1.1.
This is due to a security issue found with this functionality.

When userB is currently subscribed to a shared folder created by userA, and this shared folder is removed by userA than  userB will still be getting notifications on this deleted shared folder.