Inconsistent depth buffer Mass Effect 2

I'm having problems with depth buffering in Mass Effect 2. I downloaded this Fix for the d3d9.dll . It was working fine until recently, but now the depth buffer has stopped working, only flashing intermittently.

So, it turns out that the problem has something to do with network connection. i just disconnected my internet and the problem went away. I noticed this in the troubleshooting section, but I had disregarded it as a possibility because I had it running for a while before, and this problem only just started.