We just imaged 200 notebooks for teachers and prepared our image with the command 'zac fsg -d' prior to uploading to the imaging server.
Then we imaged all the machines, but they did not automatically register with the server. We got them to register by using the following commands:
zac unr -f
zac reg http://primaryserver
The only reason I can think this happened is because we imaged these machines a week ago, but the image was misconfigured so we reimaged them last night with a newly uploaded image. However, the device objects were never removed from ZCM thinking they would simply replace themselves.