I've now tried this on four different PC's. Two of which can run this game at 300+ fps. Spec's aren't the problem. The game freezes (permanently) when I tab out. Simple as that. This also happens to a very limited extend when changing resolutions (though those freezes only last about 30 seconds.). This was not a problem until the last few game updates. I cannot figure out why this happens, but I can garuntee it's not the computer I'm using as so many people want to suggest. This is happening on The Test Server client, and I do not have the live client to test this issue with. Can be repeated 100% of the time. Seriously just try it... I've only found that a Task manager close out will successfully close the program after this happens. Happy fixing!