Fullscreen Display
Some Mac's seem to have a small issue when going to Fullscreen Display. It goes black for 2-3 seconds before refreshing the screen. Don't worry. PC's don't seem to have this issue.
To get out of fullscreen mode press the Escape key.
Most computers (under 3 yrs old) are able to display gallerycentric exhibitions at fullscreen with smooth navigation.
Of course this will depend on the grahpics card. The Mac however, even my 1yr old iMac 24" stutters when in fullscreen mode.
So it is best to run it at the default size if you have this problem.