We are having appleshare hardware come and go in chooser for 9.2 clients too.
If you downgrade to 9.1 it cures the problem and the 9.2 latest updater doesn't cure the problem - I'm glad I'm not the only one seeing this problem. Thought I was going mad...
Put a G4 quicksilver in with 1GB RAM, every bit of software possible, a firewire scanner and so on. He can't see the server!