Previously, a user couldn't create a virtual machine in the User Portal if they only had the InstanceCreator role permissions. It showed "Not available when no Data Center is up." in the New VM dialog even if there was a data center up. Now, the error message has been changed to a more meaningful "There is no Cluster on which you can create a VM. Please check Data Center status and Cluster permissions." Permission checking has been fixed so that InstanceCreator role permissions are sufficient to create a new virtual machine.