Found a solution!
I was having the same problem ... I connected my Macbook to two external monitors via my Dell docking station using the Display Link Manager. I had no issues, both external monitors were working along with the Macbook, effectively giving me three screens. The issue I had is that as soon as I closed the Macbook lid both external monitors would go blank.
My work around this is as follows ...
(1) Close (quit) the Display Link Manager and disconnect Macbook from the Dell docking station. This means only the Macbook screen is on.
(2) Re-connect the Macbook to the Dell docking station which turns on one of the monitors. At this stage the Macbook screen and one external monitor are on.
(3) Close Macbook lid. At this stage only the one external monitor is on.
(4) Open the Display Link Manager which automatically turns the second external monitor on. Now both external monitors are working with the Macbook lid closed!
I hope I've explained this well enough, enjoy and good luck!
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