The little "right" arrow that points to the right in the preference window is not visible. This arrow indicts a closed "folder". If you click where the arrow should be, the "down" arrow appears. Clicking on it again, and the "down" arrow disappears. Still no "right" arrow. I seem to remember this on 1.2a as well as 1.2b.
Please always include build ID in bug-reports. Resolving as duplicate of bug 174831, fix checked in Oct. 17th. *** This bug has been marked as a duplicate of 174831 ***