Adding users to workgroup manager failing

I have a 10.6.8 image for MacBooks, deployed with Deploy Studio. I manage things from a MBP running Lion. As I was getting carts ready for school opening, I noticed that everything works great except adding users to WGM. They appear, and I can click add, then the screen shows no machines added, yet the save button goes live, as if I had. I have tried using no binding via DeployStudio, setting up a 10.6.8 machine to do management with proper set of server tools, to no avail. Machines not imaged add easily! I have to rename the machines Bonjour name via ARD after they are imaged, just due to the way we name our machines. I am at a complete loss as to why this is happening. I admit to not being Mr. Syntax in being able to interpret logs, etc., but am trying to nail this asap, since I have roughly 120 machines to do in less than a week. :-) Any ideas, anyone seen this before?? Take care, and make it a great school year! gar gseifert@athensasd.org