Using ZP 2.6 and using cinamaster 4.0 video filter and winDVD 3.0 audio filter. It's good for a couple of days and a few movies then I get lock-up of computer when starting movie...I am sure I will need to re-install to get it working right again. Pretty much the same experience I had last time I tried using it. Windows me/RadeonVE/Fortissimo 1/ and celery 600e. Is the new ZP beta more stable? Am I better off buying Power DVD 4.0 xp upgrade or WinDVD 4.0 upgrade? Just want stability in my DVD playback. WinDVD 3.2 is rock-solid for me but I want cutting edge PQ. My ATI 7.6 is the best PQ I have seen but half of the time my audio lags behind my video....like watching an old dubbed godzilla movie. I just want the AT! PQ and stability of WinDVD...any such animal? Don't want to have to order TheaterTek by snailmail!