ZenWSBrowser"No User object matches pattern..." Intermittently works

Hi,

I have configured a few of our Helpdesk users to use the ZenWsBrowser
utility instead of ConsoleOne. They will open the utility and do a
search on "users." Lately and intermittently the ZenWsBrowser search
fails with the error below:

No User Object matches pattern 'username' could be found below container
'[Root]'!

I cannot figure out why it sometimes works and sometimes does not.

Any ideas?

Thank you,
Troy