Final Cut Express - Strange Line Effect

When I render my cartoons in TBS 4.5 at the highest Animation setting and import them into Final Cut Express and render, the image is badly effected - black lines seeming to multiply.

What settings in Quicktime must I use to have HD quality cartoons for editing in Final Cut Express - or Final Cut Pro?

Well, render from Studio as QuickTime Movie HD 1920 x 1080 16 : 9,
Apple Intermediate Codec, 25 fps for PAL or 30 fps for NTSC…
Or, if you like, render as image sequence (PNG, PSD, TIF), assemble with Quicktime Pro,
and import that into Express…

Open Final Cut Express / Easy Setup / choose either HDV-Apple Intermediate Codec 1080i50 (PAL) or 1080i60 (NTSC) depending on your region / click Setup…

Import your rendered files and start editing…

Regards
Nolan