SD (Beta SP) Capture and Playback

I am using Catalyst Pro v4 (brand new Quad). I have a beta deck hooked up to the capture card and when I play back a video through layer 255 the result is notta so good. The image is jaggedy (???) with lines through it. Almost like it is some sort of interlace problem...Has anyone had this problem and found a solution. I'm hoping it is a check box somewhere but...Thanks for your help. Mark