With some documents when Iíve got an 8.5x11 page open in portrait and I zoom to "One Page" the display changes rapidly from the full one page display with scroll bar visible on the bottom to expanding with the scroll bar below the edge of the window and back again. It keeps cycling back and forth about once a second. Not all documents do it and anything other than the 72% zoom set by the "One Page" button does not do it. If I enter 71.5% it will default to 72% and behave itself but if I then click the "One Page" button it goes back to the cycling again.

Anyone know what causes this and how to stop it?