No idea what's happening on your PC. Could you attach the MediaPortal.log to your post? I will look into it.
Dear Marcus,OK, as a first step replace the Core.dll by the original one, disable Auto3D plugin and tell me if after that everything works as before.
OK, logging does not provide the required information.
Give me a few days and I will come back with a version with a more detailed logging. Normally it would not take so long to do this, but I have replaced my configuration files with a XML based solution which I'm currently testing. As soon as this is ready, I will provide a version that will help to find the reason for your problem.
What happens if you turn "Always show 3D selection..." to OFF
and then turn "If name contains only 3D" to ON.
Does the freeze still happen in this case (without GUI selection)?