We do apologize to you since we could not response and solve your issue quickly in the past, and welcome you to join our community. Thanks @sjefdeklerk @Heliosurge
May I ask that what's the resolution you used in extended monitor?
Have you checked the checkbox of 1920*1080 resolution?
If you are available now, we arrange one of our engineers standby to assist you through Teamviewer at present.
Edit: Please move to Help Page of Piplay to export logs to email@example.com.