I installed this lossless audio codec the other day and I don't know if it is the culprit or the Media Player Classic - Home Cinema update I did recently, but YouTube vids and even some games have been exhibiting audio problems. I've done MPC-HC updates before even running it with MadVR and LAV filter plugins with no problems though, so I am leaning toward Lagarith. I've for now uninstalled Lagarith but haven't done much testing yet. Flash Player (Shockwave) is updated btw. My Realtek onboard is updated as well, and I'm running optical out through a Yamaha receiver.