I couldn't tell what you meant for a while looking at the picture. I think your implying there is a pincushion effect (see picture below)
Does this affect all sources? (tv and hdmi?) or is it just on the menus?
Usually this is controlled by a setting stored on the mainboard I believe so may be changeable in the menu, or in the service menu. I know very little about DLP's though, so although a setting can probably adjust that, it might indicate a actual problem.
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