Thank you so much for reaching out to us! I am sorry to hear that you are running into this issue, but I would be more than happy to assist!
Based on the description of the issue, we could be running into a problem associated with the DisplayLink drivers are your system.
If you have not done so already, please download and install the driver from this link -> https://s3.amazonaws.com/plugable/bin…
If you have already done, we may be running into a common problem that we have isolated with Mac systems regarding Gatekeeper blocking the driver from activating. When you have a moment, please review this link, and follow the instructions-> https://plugable.com/2017/10/27/how-t…
I hope this information helps, if you have already followed these steps, and you are still experiencing issues, please let me know and I can provide additional troubleshooting steps.
Thank you for your time,
Product Owner & Technical Support