Hello @SteveHeist, we're be using one issue report per unofficially supported game title, and you've already mentioned this where it matters at https://github.com/ValveSoftware/Proton/issues/225#issuecomment-419231634.
Closing in favor of the existing issue report.
Compatibility Report
System Information
I confirm:
steam-611500.log
Symptoms
Game refuses to connect to servers on latest update - worked nearly flawlessly on previous update.
Reproduction
It should be as simple as installing the game and trying to run it.
For expedience's sake, and trying to see if there's any way of fixing this quick, I combed through the above log and made a sort of "highlighted points" segment.
Log Excerpt-611500 Sept. 6, 2018.txt
There is an older "whitelist" request from the last update that might be worth noting. I have already made a comment there, but wanted an updated one to specifically mention the error revolving around the new update to the game.
https://github.com/ValveSoftware/Proton/issues/225