If you want to share your screen with Zoom, then the screen sharing is done by Zoom and not myViewBoard. So please make sure that your Zoom application works correctly. As soon as you can share your screen with Zoom, open myViewBoard for Windows or the myViewBoard WebApp (Google Chrome) and begin your presentation.
Since Zoom and myViewBoard are technically two different applications, you would not even have to integrate Zoom in the FollowMe AI settings to be able to use it with myViewBoard.
However, integrating Zoom has the advantage that you can start it quickly and easily while using myViewBoard.
I guess you are talking about the browser-based version of myViewBoard, right?
I've just uploaded a few different PDF files into myViewBoard and I couldn't reproduce your problem. If it's not confidential, can you send me a screenshot of this blurred PDF when it's imported in myViewBoard? Also, it might be helpful for us to have the PDF file itself.