Interlacing and field rendering in After Effects
When you render movies in after effects you must have field rendering turned off in the 'Render settings' dialog:
If you dont then any text or graphics might look like the attachment.
In addition - if you have rendered dv-ntsc or dv-pal files, quicktime player will not show these lines - it cheats when displaying the images.
Catalyst will show these lines at all times.