Pdf's not displaying beyond 1 page

Aloha. In my research section, all of the pdf’s that I have imported are not displaying beyond the first page. When I click on one and start scrolling down, it’s blank. If I put my cursor over the blank area, hold it down, and drag, the pdf text starts to appear in that area but it doesn’t display the entire page. If I then scroll to the next page or back to the page above, it’s now blank. I understand that I can open the pdf in an external editor or press the arrow key in the bottom right to pop it out in preview, but why can’t I just scroll and view the pdf within Scrivener itself? I would like to be able implement the split screen and view two at the same time but I am unable to scroll and view pdf’s with multiple pages. Mahalo for your help!

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