On one of my Macs after upgrading to Mountian Lion and updating the iWork apps, each iWork app has a little X with a circle around it in the top left corner? The applications all work fine. Only happened on the one machine.
Has it anything to do with how you installed it?
It may also indicate sandboxed or not sandboxed.
Apple no doubt may consider revealing what exactly it all means. Or perhaps it is just intuitive?
Interesting thing is the one went away on iMovie and Keynote, they work so no worries...
Version zero perhaps!
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