The simple animation plays with no problem in Motion, and also plays perfectly if previewed in Final Cut on the timeline before rendering, but once it is rendered it will come up with interference as seen on the clip above. It's very random though. Sometimes it will do it, sometimes it won't. If you re-render the same clip, sometimes it'll be fine, sometimes the interference will occur in different places. There's no pattern. We run a DV-PAL Anamorphic timeline in FCP.
Bizarrely it works absolutely fine on Intel machines running FCP6, it's just the G5 PowerMacs with FCP6 we're having problems with. The only thing i can think of right now is that the machines just cannot cope with the templates. They do take around 2 minutes to render this simple 5 second animation.