Have you tried ffdshow? I'd also recommend removing anything Divx-related on your computer, including running regedit and removing any matches for "divx", and unregistering and deleting any remnant Divx filters or dlls in system32. Also, what if you uninstall Divx 5, and just install 3.11? Do the 3.11 movies with the 3.11 filter look the same? If they do, it doesn't sound like the Divx filter is the problem.