I agree with jens, I think something else changed, I can't see how this has anything to do with changing KixTart versions. Maybe you enabled/disabled local profiles or you have introduced mandatory/roaming profiles on the server or maybe someone re-installed windows.
More details might help narrow it down.
PS: Moving back & forth between kixtart version, especially with Win98 clients is not a good idea. All the DLLs, EXEs and KXRPC services must be the same version. It is very difficult to keep these files in total agreement across the complete network if you keep changing back & forth. MCA has an excellant utility for verifying all components are in agreement. See his site for the utility.
I though just came to me. If Kixtart is failing completely because of incompatibilities in its components it might have serious implications but I can't see how it would affect local profiles.
[ 07. January 2003, 20:01: Message edited by: Jack Lothian ]
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Jack