Normally when users logined the computer several days ago, it will display the logon.bat screen, I didn't change anything but now it doesn't appear that screen when log in these days.
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What version of KiXtart? I use the kix32.exe which publish in Jan. 2002, the kx32.dll version is 3.60.0.0

What client versions? windows xp sp1, and some sp2

Have you looked in the event viwer for the clients to see what if any errors are being generated. yes, I read the event viewer, but not special error in it.it happened on all the clients, and a new installed pc also happened. so I think maybe something wrong in the server.

How many Domain Controllers? 2 Domain Controllers.

Are all Domain Controllers replicating correctly. yes, I check the replication, they works well.
Check and Double check replication

Is it one or two clients or all clients having issues? it happens on all the clients, sometimes some work, sometimes some don't work, but it happens on all the clients even the new installed PC.

How many clients overall on the system? about 20 PC, some of them are workstation, the speed is very fast.

What are the link speeds of the network? 100Mbps connection speed, the network is well, we read the files from the servers, it is fast. I tried to run the script manually, it also finish running very fast.

Have you check to make sure no one has modified the rights and that the logon is setup in the admin tools. not, I am the only administarato or the server, these days I changed nothing settings, only just updating the server service pack to win2k3 sp1, but I updated it 1 month ago, it worked well at that time after I updated. only these 2 weeks has the problem