Issues enabling CBT

Hi,

My VM's are hardware level 7, with the latest VM tools installed. When I right click the VM's in my vRanger inventory I have the option to enable CBT. I tell it to enable, it takes a second, and the CBT icon appears. However, as soon as I refresh the inventory, the CBT icon is gone and the option changes back to enable CBT instead of disable CBT. What gives?

ESX 4.1 & vRanger 4.5 (Same behavior exhibited with the 5 beta).

Thanks