Hi Robert
Would you mind giving us a breakdown of the format you are capturing and the output you are using?
Any and all information including the TV format - eg: PAL/NTSC would be helpful in diagnosing your problem.
But to jump the gun so to speak - even though you have 720p source it sounds like either a field order issue when played back on a CRT TV (maybe in conversion?) or a frame rate issue when played back on a device that doesn't accurately handle the framerate of your outputted material.
Let us know as much about your setup as possible.
Thanks
For instant answers to more than one hundred common FCP questions, check out the LAFCPUG FAQ Wiki here : [www.lafcpug.org]