I generally only use RealPlayer when downloading and playing .rm files, but when it's needed, I've never had any problems since Pre-version 10. This upgrade was quick and easy and I've successfully tested it out on a test sampling of my .rm files. I tend to use Windows Media Player for .wmv files and QT Player for most other formats. Maybe if I tried using just one player for all formats I'd be having loads of problems, but they each perform as expected when they are called on.