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Have you renamed the nands in any way? need to have no spaces or strange characters in name, if you did,
What does the log say when you go into it? haven't looked at one myself, should be able to get to it in recovery, maybe. should give someone a clue how to help you.

ok when doing a nand back up is there only suppose to be an x on boot system and data the click on perform backup.???try renaming one without the dashes and see if it works.
Let me check my nand file real quick. and recovery.
edit: nope, dash is ok. let me look at recovery and see if I can find the log for you.
Edit 2, make sure there are no spaces in your nand name.
ok formating and changing ext-2 to 3 fix the problem thanks you guys for the helpBoot, System and Data are all you would need. I do sd ext if I am using a2sd, as well.
what size sd card are you using? 2 gig has problems with various things. do you have a different one you can try like Robo suggested?
Were you ever able to find the recovery log as described above?