Smoothing Scrolling Problem

Hi all

I’m writing an app which basically scrolls lines of words left or right over the stage. The words are textboxes inside movieclips approx. 500.

I’m using onEnterFrame to +/- the movieclip containers x value.

The problem is that some of the words (random selection) do not scroll smoothly i.e. they are ‘jerky’ or ‘jittery’ or shudder across the screen, unlike the rest of the words which scroll smoothly.

Any tips?

Thanks (-: