Dissappearing folders

OK, here's one that has me totally stumped. I have multiple W2K workstations all accessing the same server share on the same domain. A user created a folder and put some files in it. He has done this several time before with no problems, but this time, noone else can see them. Even him, if he logs on at a different computer, he can't see the folder. He, and others with permission, can see other folders/files that he created, but not this one. The permissions on the folder and [sub]files are modify for all involved, but even the creator/owner can't see the folder from a different PC. The server the files are on is NT4sp6a. Has anyone ever seen this before?

Help!

 

If the user can log onto the server, have him do so and then take ownership of the vanishing folder.