Some pages in my 500 page book suddenly turned grey and export as blanks (see pic). I can't delete them, as In-design crashes every time. I have also tried to delete the preferences and exported the file as IDML, neither have worked. Any suggestions?
Can you try and move sections of the doc to new, empty docs? That's a big doc too, you might consider breaking it into chapers and using the ID Book function. I use that for docs of over 50 pages. Less chance of corruption.