vmware tools failure with 4.1 Update 1

We started upgrading vmware tools after our ESX hosts were upgraded to 4.1 Update 1.. Our vCenter is at 4.1 Update 2.

I have not figured out what causes this, but an automatic vmware tools upgrade will occasionaly fail and it will not let me end the vmware tools upgrade. I get a pop-up mesasge saying this is not allowed in the current state.

To resolve this, I was able to log into the ESX host the VM was running on  using the vSphere Client, and end the vmware tools upgrade. I was then able to do the vmware toold upgrade from there.