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To repair disk permissions: http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh17.html Reset PRAM:...
This worked for me: Had the same issue except the start menu did not work with the dock hidden or not hidden. I did a permission repair and...
This worked for me I did a permissions repair on the startup drive and zapped my PRAM. My start menu now shows up. Don't know which one fixed it...