Newbie question:export to PDF problems

Hi,

I’m currently working my way through the Scrivener tutorial for the first time (using Windows 7). I’ve just got to the ‘Compiling’ feature. When I do a demo compile and make a PDF of the tutorial as instructed, the first 4 pages come out okay, then the remaining 42 pages are either blank or just have a random image, like so: Capture.PNG or just a line across them.

What’s going on?

Many thanks