When using the default Red Up arrow if moved or sized depending on the number of thumnails on a menu page it can pick up part of the grid lines resulting in a ugly line appear above the arrow head. Moving and/or resizing the arrow eliminates this.

The problem is of course you can end up with different sized arrows and/or placement, again making the finished DVD look unprofessional. Is this just a problem in preview or does it carry over to the finished DVD?