Odd Page-down behavior

[Jim Light]

Sometimes when I open and start paging through a FrameMaker file, I'll
get several pages in, press Page Down and instead of getting the next
page, I'm taken back to the first page.

 

This isn't a huge problem, and I have never noticed any serious
consequences. It just happened again and I'm using the latest build
(7.2b158).

 

Is this just a quirk I should learn to love or can I prevent it?

 

Thanks.

 

Jim