I too am seeing these issues. The machines image and the account is created, but it is not hidden and the machine is not managed despite that being set in the configuration. I also am seeing that the image is not being logged too.

What is going on? This seems like an extremely buggy release.

Which process did you use to create your admin account?
Did you create the build/install add the account and then use composer?
Did you use instadmg dmg and add the account with a script?

My test 10.8 image (created with instadmg) is placed on a system well, and I'm noting some minor permission issues with the admin user created by the script used for 10.7 (create lion user)

i did clean install, never booted, used composer and target mode to make image. used casper imaging check the managed box to create management account on computer. then when it was done it wouldn't work, but I found out other mac airs I have are have same problem that have been working fine. don't think it is image

I followed more or less the same process as Cody: Clean image, captured with Composer (8.6), I and adding account via the Management tab in the configuration. Imaging is via netboot.