The file is probably not corrupt. Go to Slide Show > Set Up Show. Do you have
it set to show all slides? If not, do so and that will solve your problem.
If that isn't the problem, check to make sure that you haven't set the last
slide to "Hidden". In the Slide Sorter view you'll see a diagonal line through
the slide number below the lower right corner of the thumbnail. In Normal view
you can go to the slide and then go to the Slide Show menu and if "Hide" is
highlighted, click it to toggle it off.
Another thing to check is how the next to last slide is constructed. Does it
have an object that is linked to "End Show"?
If none of those help let us know and we'll offer more suggestions.
