Hmmm.. Actually you should be able to have up to 5 external screens on this setup: one directly connected and 4 DisplayLink based.
Anyway what I'd do is to uninstall the DL drivers (which resets the screen-adapter mapping), reboot and connect the external screen.
Then install the 1.6beta4 and try to configure everything again. If the problem persists send us the logs collected when everything is connected.
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