You are right it's an DirectX issue and it's easy to fix. If you install the stand alone version you have to update DirectX. I had the same Problem under Windows. You can download the DirectX 9c Update here: http://www.microsoft.com/downloads/en/details.aspx?displaylang=en&FamilyID=3b170b25-abab-4bc3-ae91-50ceb6d8fa8d