one note - mmc0 and mmc1 MAY be backwards in the /dev enumeration, so /proc/partitions shows my swap partition as mmcblk1p3, but I must use mmcblk0p3 to access it.

ls -l /dev/mmcblk* shows the minor devices are out of sequence, mmcblk1 has 0,1 (the external card), and mmcblk0 has 8,9,10,11 which probably explains the problem.

You can try removing the external card if you aren't booting from it and check the /dev directory to see what the correct numbers are. (I may have something else turned on which is causing this).