Network account login problem.

On my home network, my wife's network account shows up in the login dialog list on every system except one. On that system, here network account doesn't list. Selecting "Other...", typing in her account name and entering her password results in the invalid password dialog behavior. Performing the same operation on any other computer on the network works as expected.

Thanks in advance for any suggestions for debugging this problem.

p.s. I recall in the past that removing some parameters in netinfo prior to Leopard could resolve this problem.