After updating to Xsan 1.1, do not use Xsan Admin 1.0 to administer the Xsan 1.1 network. If you do, you may get a message that says the license is invalid. To avoid this issue, use Xsan Admin 1.1 with Xsan 1.1 systems.
As a general rule, you should always use the latest version of Xsan Admin that is compatible with the version of Xsan that is installed. For example, use Xsan Admin 1.1 with both Xsan 1.0 and Xsan 1.1.