Please, try the following: right -click on the Host icon, select Settings for Host -> Options and enable the Use legacy capture mode option. Then restart the Host - you can do so via Host's menu - and see if the issue is resolved.
I'm sending a link to download special Host executables (rutserv.exe and rfusclient.exe) to you via your open ticket now. These executables have special logging enabled that will help us diagnose issues with CAD. You will only need to replace the original Host executables in your Host installation folder and then send the txt logs back to us (you can examine the logs before sending to us, of course).
Michael, let me know if you also want to participate in diagnosing this issue and I'll send the link to you as well. I'm not making the link public because it's for testing purposes only.
We do appreciate your feedback. However, not each and every situation can be easily reproduced in our testing laboratory, simply because there are countless combinations of OSes, hardware profiles, settings, environments etc. Therefore we rely on our customers to provide feedback and extensive information about what's going on. Sometimes we even ask for remote access to the Viewer PC at least to be able to log in and see what's happening with our own eyes.
That been said, we are currently working on this CAD issue and preparing a separate Host executable with extended logging capabilities just for the purpose of troubleshooting.
Michael, we will appreciate it if you let us know what other issues except CAD you are currently having with version 6.x.