when you play back the timeline, both fields of each frame are displayed. when you scrub the timeline, however, only one field is displayed. as well, only one field is displayed when you pause or stop playback on the timeline. for example, if you see a "glitch" in your project when you play it back from the timeline, but notice that when you scrub on the timeline to find the glitch, you can't find it, you may need to switch the field you're scrubbing over. you can then return to your timeline and find the problem by scrubbing.

    to change your scrubbing type:

    1 choose project ] project settings ] general.

    2 click the advanced settings button.

   

    3 under scrubbing type on the general page, select either field 1 or field 2.

    4 click ok to return to the project settings dialog box, then click ok again to return to the timeline.

    5 when you scrub the timeline, or pause or stop playback on the timeline, only the particular field you selected will be displayed.