If you are trying to put an NTSC video on a PAL disc this is likely to happen. Check the frame rate of the original video and if it says 29 fps then it's in NTSC. A PAL video is only 25 fps so this causes problems with audio and video sync if you try and convert between the two. If the video has originally been ripped from an American source then it will be in NTSC. The best thing to do is to change the disc format to NTSC in Roxio. This will then burn it without trying to convert to PAL but it will make an NTSC disc. Most DVD players will convert it to PAL as it plays, so it can play on a UK TV set. However there are some that don't, so if you get a black & white picture that's slightly stretched, then it won't accept NTSC discs. But most players will convert the video format before it gets to the TV so it should be ok.