I don't know whether you solved the problem or not but this might help other who face same problem.
There are 2 files available
BBB-eMMC-flasher-2013.09.04.img.xz
Angstrom-Cloud9-IDE-GNOME-eglibc-ipk-v2012.12-beaglebone-2013.06.20.img.xz
Former is the eMMC flasher which is used to flash the eMMC and when the process is complete the 4 USR leds will be stable. Second one is used to run angstrom from the microSD and you can connect HDMI or cape to ensure that.
Regards
Bishan Preet Singh