This is a known issue with NVIDIA Optimus platforms when you try and use the external HDMI, laptop screen and DisplayLink displays. It's due to the way the NVIDIA driver interacts with the system and the Intel driver, and there is no easy work around we can put in place at the moment. The NVIDIA driver behaves differently on Windows 7 which is why you don't see the issue on this OS.
We are seeing what we can do to fix this, but it's not easy.
Wim
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