I'm working on an urgent Keynote presentation for work (yes, on Sat night!) from my boss's MacBook at home ... or, rather, I'm trying to. Keynote just won't open the Keynote file I created yesterday on a different MacBook (reading from USB key). It says I need the newer version of Keynote in order to open this file. I checked ... the version installed was the latest version, but just for good measure, I've just re-installed the update from the Apple site (with boss's permission, lol). No joy ... still returning the same error message. Insists the file version is newer than the version of Keynote I'm running.