ChristianP, I have the exact same problem. If I unplug the display link adapter then the lock screen no longer has any issues. Attached is the requested information from running the debug tool.
I just uninstalled and reinstalled the latest driver today from the web to ensure that I had the latest version.
Another issue that I've noticed is that after first booting my mac, the display link monitor doesn't get detected right away, it is blank for up to 30 seconds after logging in. In fact, I think the display link driver is delaying execution of my user's Login Items. This is made evident because I don't see apps like Dropbox or Alfred become available until the display link monitor has been detected. Any thoughts on this?
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