A very big issue I have been having recently. I was working in a file and everything appears just fine in Open GL, but when I render, half of my objects disappear and are no longer visible. They are still there, because if I hover over them, their outline is highlighted. Then I go back to Open GL and they are still there (This is all from the normal 3d view, not a viewport) There aren't any classes hidden. It gets progressively worse every time I render again. The only way to fix it is to close