Today I upgraded to r31065 (downloaded a prebuilt HD image), and noticed that the Tracker uses a text file icon for the common folder. Also "Get Info" for the "common" folder, indicates that the folder is a text file; otherwise, the "common" folder performed as a folder should.
To fix the problem, I used the "File Type" add-on to change the file type to a directory.
I this merely a screw up in the image I downloaded, or a more general problem?
--Gerald