DisplayLink Mirroring Instead of Extending

[Casey-Cayce]

I've been using DisplayLink for a couple of years now to run a 65" Samsung LED display on the wall in my studio, and it's been working flawlessly. I just updated my OS to 10.13.6 and had to download the v4.3 beta 5 driver to make the connection. Having done so, I can't get it to stop mirroring and allow the Samsung to be recognized as an extended display in my System Preferences. I have another Dell display as the second screen on my desktop, the third—if it was working correctly—would be the wall-mounted Samsung. Preference shows the Dell, along with my main, but not the Samsung, though it's active, but mirroring.

Any suggestions to help straighten this out so I can get back to work would be appreciated.

Thanks.

Cayce

27" iMac Pro, 10.13.6