If I either run AnyDVD and play from the Blu-Ray drive, or copy the disk to the HD then play with PowerDVD I get slightly choppy playback. It almost looks like the framerate is dropped to about 15 fps. But without AnyDVD running then playback from the Blu-Ray is fine. Any suggestions? This is new and very fast QuadCore computer with an ATI HD2400 card and SATA3 hard drive so I do not think it is a hardware limitation.