I've been running Fedora 13 beta and found that the button nautilus has provided for toggling between path as buttons and path as text has been removed.
Found this upstream bug:
and some further discussion:
This should be mentioned in the release notes.
fedora-release-notes-13.2-1.fc13 has been submitted as an update for Fedora 13.
fedora-release-notes-13.2-1.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.