Scott taught me this one. Well, actually, Scott taught Kris and Kris taught me.
Every now and then PMP will be unable to open InDesign documents. Easy fix. Just delete from…
/Macintosh HD/Users/[username]/Library/Caches/Adobe InDesign/Version 5.0
…the following two items…
InDesign Recovery (folder)
InDesign SavedData (file)
…works fine.
This fix is for CS3 only, CS2 has its own fix for this problem. Hopefully I'll never need the CS2 fix.