There was an vmotion problem on one (of the three) ESXi 4.1 servers. So I restarted the Management network, the vCenter service (and after that the server) and I restarted the management agents.
After all those restarts I re-opened the vSphere client and connected to the vCenter server. After that 3 VM's (of 10 on the same ESXi) were grayed out & "Invalid" and are impossible to manage.
I tried to remove one of the 3 VM's from the inventory and I tried to add it to the inventory from the datastore were the VM is located. Also this option is grayed out so the VM is impossible to add back to the inventory.
I am out of any ideas at the moment....
All the VM's are still responsive (via RDP for instance)..
