App Store offers update, but says it's already installed
The App Store is offering me an update to Window Tidy, and the version number is in fact newer than the version on my Mac, but while the App Store icon in the dock shows the update available badge, the store lists the update as installed, so I can't download the update. This is the problem with cloud computing. It works great when it works, but when it breaks, I can't fix it myself. Grrr...
Mac Pro, OS X Mountain Lion, 8 x 2.8 GHz 10 GB RAM, Radeon 4870