there are many machines those RDP is not working after VM tool update.
Please replace RDP related DLL file from any working server of same OS version...
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Please try these wo steps
1.Restart the Vm's
2.Resize the Vm's
Could you please confirm the ESX/ESXi version.
in many cases it is seen if you update VM tool via update manager it works file in Ver. 4.1 or 5.0