When assigning roles to a user, if an administrator wants to add all sites bar 1 and click on the top level of the tree they are unable to deselect any of the sites below it. We would expect to be able to click on the top level for the colleges and then deselect 1 college from that list. As we are unable to do this, it now involves having to mark every single college which takes a significant amount of time when assigning roles.