I have Corel 2019 and windows 10. I'm working on a banner that is 6 ft by 3ft. when i scroll in and out the images disappear. you can see them in wireframe or click on each one individually and click shift page up. but when you scroll out again to move they go hidden again.
Works fine here. I have rcorded a screenshot video, but i can't upload here. Try to repair.
Could be low VRAM or RAM. Is your PC good for larger projects?