SInce early this year, ediff-directories has been confused by a trailing slash on default directory names. For example, say I'm in directory

and I start ediff for directory comparison the minibuffer will show "/dir1/dir2/" and I hit return. The minibuffer then shows "/dir1/" and I hit return and I get a response that the two directories are the same. If I do the same sequence but for each directory trim the trailing slash in the minibuffer, everything works as it always has (I believe that the old behavior did not have the trailing slash as the default as it does now).