just tried PTP 2.1 test version on a mac, output local on my computer.
If i set up a splash screen the defined image is not showen in the tour, but all menus and controls are hidden. If i click in the browserwindow all menus and contols are visible.
If i enable the overlay, the overlay is visible and the image is still hidden.
If i enable "automaticly close after ... seconds" the image is visible.
may be a bug...?
Are you using the View last built tour... button in PTP 2.x to view the tour offline?
Which browser are you using and on which OS?