Date picker popup displays blank when overlapping fields with ajax suggestions

If a date picker popup (ie: Due Date field) overlaps another field with ajax suggestions (ie: Reporter field), then the popup display shows blank portions. To reproduce the problem, place the Due Date field slightly below the Reporter field, then type into the Reporter field to bring up ajax suggestions. Now if the date popup is brought onto the screen, the portion that overlaps with the Reporter field will be displayed as blank.