Only one user at a time can log in per client

Server: 10.6.2
Client: 10.5.8
The share point on the server is the default of /Users. Home directories are configured as /Network/Severs/hostname/Users/username. In the "Home" tab of each user, the home directory shows up as "afp://hostname/Users", which is the default when creating a user.
On a given client, only one user can log in at a time. If the first user switches to the login screen without logging out (fast user switching), when the second user attempts to log in, they get an error "You are unable to log in to account "xxxx" at this time."
Looking in the secure.log, the error appears to be "file busy":
Mar 7 12:13:39 G4-MDD authorizationhost[677]: ERROR | -[HomeDirMounter mountNetworkHomeWithURL:attributes:dirPath:username:] | PremountHomeDirectoryWithAuthentication( url=afp://Mini.local/Users, homedir=/Network/Servers/Mini.local/Users/xxxxxx, name=xxxxxx ) returned 16
The server's /Users directory is mounted. It appears to be trying to automount another copy, rather than use the existing mount.
How do I resolve this so multiple users can be logged in at one time? Surely I don't have to create a share point for each user?

I'm glad to hear I'm not the only one encountering this problem, although the fact that this problem has apparently existed for some time is mind boggling to me. The idea that there is some data corruption issue here is not a valid concern. We did this all the time on Linux in my previous life. There is no need to unmount the mounted directory, at least in the default case. The mount point is /Users. Home directories on the server are /Users/fred and /Users/sally. Automounter mounts /Users at the mount point /Network/Servers/serverhostname/Users. Fred is logged in and can access /Users/fred. Now Sally wants to log in. /Users is already mounted. There is no reason to unmount/remount /Users. OS X can see it is already mounted. Just log Sally in - she already has full access to her files.
If Fred and Sally reside on different servers, then there would be different mount points /Network/Servers/hostname/Users - again no conflict in the mount points.
The only solution I can see right now is a separate share point for each user, which is unacceptable. That might work for my two users. It's hardly scalable from a maintenance standpoint.
I do have the problem of fred logging out and sally not being able to get in right away, but that period is probably less than a minute. Wait a minute, then sally can log in.

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