I've been working with ID every day for ten years and I've never seen anything like this. Currently using CS5.5 on Win 7.
In a 150-page book, twenty-some pages in the middle have suddenly gone blank. No images, text, or master elements show up on the page - just white space surrounded by a humongous blank pasteboard. The links still show up in the links pallette, but they are marked with "PB" (pasteboard) instead of a page number. When I hit "go to link," it shows an empty, skewed graphic frame somewhere in a pasteboard but I can't do anything with it. When I try to draw a selection frame around the pasteboard area to "catch" any images lurking there--nothing.
I tried exporting to .idml, which recovered the master page elements and a few of the captions and text boxes, but all graphics are still missing (although links still show up in the same way in palette.
I am frantic - this was due to upload to printer today! I really don't want to have to trash and re-build those twenty-some pages...
Thanks
Alison