Something to note on this, if the SB Benchmark is anything to go by, DX9 will no longer be supported. This means they either need to legitimately fix the DX11 issue, or just allow it to continue and deal with an angry playerbase. So I feel that this is going to go away with 4.0. Additionally, usually when this happens to I just restart the game a couple times and it works, although I've only had it happen a few times.