There are a number of folders and files that should be removed from the user library directory. I have a list of folders/files to remove from your user Library directory. From Lion, hold down Option to see the Library folder in the Go menu of the Finder because it is hidden from normal navigation.
This is the list of files that should be removed
~/Library/Application Support/Adobe/Adobe InDesign CS5.5
~/Library/Saved Application State/com.adobe.InDesign.savedState
Close InDesign, then remove all of those files (take a copy before you remove them to be on the safe side), and then restart.