I'm experiencing almost the same problem!
I'm running Remote Desktop Manager Enterprise Edition 8.0.4.0, RDM, on windows 7 x64 SP1!
At a fresh start, or if I kill the RDM process and restarts it, it works for a while but then it starts with a protocol error after which some or many embedded sessions dies and then I get this ActiveX error. These problems started after I upgraded RDM to version 7 something and has been present since on an intermittent basis.
I'm running Remote Desktop Manager Enterprise Edition 8.0.4.0, RDM, on windows 7 x64 SP1!
At a fresh start, or if I kill the RDM process and restarts it, it works for a while but then it starts with a protocol error after which some or many embedded sessions dies and then I get this ActiveX error. These problems started after I upgraded RDM to version 7 something and has been present since on an intermittent basis.