I deployed KiXtart 4.10a yesterday afternoon. Things are working fine here. (Single domain, ~500 clients, Win2K/NT only, no AD.)
I had to modify the logon script because I used the MakePath() function on the ScriptLogic function board in the script. It is incompatible with KiXtart 4.10 because it uses a Join UDF that is slightly different from the new internal Join function. I've posted a comment for the author in that forum.
Rather than re-invent the wheel, I got the MakePath() UDF from this board, translated it to my style and removed the Join() UDF from the script. Woiks like a chaaam, it does.
New Mexico Mark