pagefocus event not firing?

I'm having an issue with large monitors when dealing with powerpoint files (I assume this is because the pages are landscape)

The issue is that when I scroll to the bottom of the document, the last page doesn't load, because it doesn't pass far enough into the viewer. (shrinking the browser window is a workaround, as it allows the user to scroll down far enough)

Here's a screen shot, the monitor resolution is 2560 x 1440

In the screen shot it is impossible to get the last page of the powerpoint to load without resizing the browser window.