Keynote 5.2 won't open with Mountain Lion
I've been using all of iWork with Mountain Lion since July 9 when the Developer GM Seed was released, and it worked fine. Now that the public has Mountain Lion, iWork was updated and I get the message "Check with the Developer to make sure Keynote works with this version of OS X."
I know for a fact this must be an error, but since I've had iWork '09 since its release on CD I haven't bought it on the Mac App Store and therefore cannot use that for this problem. (Although the App Store updated Keynote and the rest of iWork)
MacBook Pro, OS X Mountain Lion, Development (late 2011)