You can clearly see a rendering bug there. Err... I guess I should have taken more technical stuff? No my dox did not fall through.. but those are my mex under construction.
It's just texturing problem, not usually related to game. Is it happen on your computer with GeForce GT 650M (this thread)?
Technically yes. I figured it might be related to either. That issue has only started doing it while using Windows 8.1, and it's stopped triggering for PA (but still happens in Chrome and Skype). It's related to software and OS, not hardware. Hasn't done it for an entire day now