i have installed the free version 184.108.40.206.
i have a java console of another application open and i opened RDM with one RDP session.
after a few seconds, i could see some of the java application's details blending with the desktop of the RDP session.
i have tried updating the driver of my video card but there was no update.
i have downgraded to version 220.127.116.11 and things looking good.
hope you will solve this,
it took it a little bit to appear in the 18.104.22.168 version too.
i have attached a screenshot to explain the problem.
We use the Microsoft ActiveX and we have no control on how it draw the desktop. You could try to use the classic UI in RDM to see if it makes a difference. It's in File->Options