I have tested very extensively and here is the scoop:

When there is no ZEN agent installed on the computer the client can open
IE and go to the www.Lexis.com site, login and search. Upon clicking on
search the page will update with the results. When the ZEN agent is
installed, the client clicks on Search and the page goes blank and the
status at the bottom displays 'Done'. They hit F5 and the page updates.

This is consistent on Win2000 and WinXP. It is also consistent with ZFD
Agent 6.5 and ZFD Agent 7.

This seems bizzare and unrelated but it is. No ZFD agent and the website
works fine, with the ZFD agent the website does not work correctly.

The above issue only occurs with IE, the site works correct with Fire Fox.

Any help on this is greatly appreciated.

Thanks, Jeff