Last week I had the latest snapshot as of Friday and the Overlay was working perfectly in League of Legends on my Windows 8 x64 machine. I then left on a business trip and came back yesterday. I updated to the latest snapshot, g8cbf176. League of Legends also had a patch (not sure if this had anything to do with it). Those were the only two changes to my PC since the overlay was last working. The overlay no longer displays in league of legends at all. I tried rebooting the PC and disabling/re-enabling the overlay.