"Known Issue: Black Screen With Visible UI: Some Intel users may find that when DirectX 10 is enabled, only their UI is visible and the rest of their screen is black. If this occurs, we recommend you disable DX10, enable DX9, and restart the game client."

Windows Update just sent me an update if my Intel graphics drivers.. This new update allows me to use DX10 for the first time on this PC.. If you were forced into using DX9 because of this issue, open windows update and check your optional updates.. There may be a Intel Graphics update there waiting for you to fix this error as well.!!