The latest SAN-OS is 3.2(1), and a new "feature" in this release is that Fabric Manager no longer lives in the switches (you can't install it from the switch web interface anymore, only Device Manager is there). Instead you get a page telling you to download Fabric Manager from Cisco.
I've logged into the Cisco site, and the latest Fabric Manager for download is 3.1(4).
Where do I get Fabric Manager 3.2(1) from??