I think you're maxing out the CPU on this system. You have 4 virtual displays connected and each display will need CPU to encode the video changes in real-time and send them to the device. This is on a 2.2Gig M processor that is not that powerful.
DisplayLink supports 1 full screen video on a USB display at a time. For this to work, you need to have less displays or a more powerful PC. This current spec isn't going to do what you want.
Wim
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