To check a hidden share IE SERVERC$ you have to change the service acccount logon information to an admin account and cycle the service. Just fyi.
Also it appears that if you delete a monitor that has monitors below it visually that when the page returns the list is not accurate unless you refresh again. Also is there a way to define the alerts on a monitor after the service has been created? It seems you have to delete and recreate it to change the alerts.