Sorry for the inconvenience this has caused. To help us investigate the issue, could you please provide the following:
A screenshot of your D5 System Info page
Screenshots of your hardware details from Task Manager (please include the Performance tab showing CPU, Memory, GPU, and Dedicated GPU Memory)
Additionally, could you please open a new blank project or a demo scene in D5 Render 3.0 and let us know whether it opens and displays normally? Thank you for your patience.