Have you checked if you have the "Transparency anti-aliasing" option of the video card settings turned on ? If yes, turn it off because it creates visual problems, and the manual alerts about this.
If it's not that, then I'm sorry but, although it's clearly a problem with your system (there are exactly 2 users that reported parts of objects missing, and jhonarmstrong said it hasn't replicated), I think to have exhausted all the possible solutions.