Looking at your logs it seems that the DisplayLink agent is not running, so we need to investigate if it's correctly installed or if for some reason is crashing.
Could you please list the files in /Library/LaunchAgents/ and check if these 2 files are available:
-rw-r--r-- 1 root wheel com.displaylink.useragent-prelogin.plist
-rw-r--r-- 1 root wheel com.displaylink.useragent.plist
If these files are not installed, it would help if you could run the installer once again and save the Installer log. To save the log, complete the installer wizard and before pressing the Restart button, open the log from menu Window->Installer Log and press Save button on top-right corner.
Could you also please grab your full system profile few seconds after you login in your user session (better with the DisplayLink adapter connected), zip it and post it here?
To get the full system profile, just open the System Information tool (Apple menu->About this Mac->More info->System Report). Check the File menu and select Show more info (or if already selected you should see Show less info) in order to show Logs (as long as other items) under Software category in the left pane. Save the file, using Save..from the File menu.
The full system profile include system logs and crash dumps, so we can check if something is wrong during the DisplayLink agent startup phase.
Thanks
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