I am running version 4.20 beta 5. A sequence played in the Customise Synchronisation window runs perfectly when I hit the play button but when I hit Preview it stutters and will not snyc properly. I have tried using the Create button but this still gives a faulty version. An Exe file on Cd also runs defectively. Has anybody any bright ideas as to what is going wrong? I am working on a lap top running Windows XP(home) with 20Gig Hard Drive and 256mb of Ram. The graphics is an ATI Mobility 16mb.