Display not properly refreshed
In the latest versions the screen often isn't refreshed properly. Only after rescaling or changing to Preview mode the old data is hidden.
Kelly Vaughn commented
This has been the case for me as well. When I page through a document, the pages display as blank, until I click in a text frame. So if I go through a document spread by spread, I have to click in each text frame, on each page, to see the contents.
I've found quite dramatic examples of this happening. I can make changes to text and images in Normal View, then I switch to Preview and it is displaying the older layout/text of the page.
Sometimes this happens instantaneously but more more worryingly I have scrolled through a document and seen elements revert back to how they looked days again before several rounds of amends, except they aren't really there, they're just like ghost elements that when clicked on eventually refresh to what they should be. I don't even understand how the files are retaining such old previews of the pages.