LAS 6.0 "Session expired" problem

[=?big5?B?QW50b24gQ2hlbiBcKCCzr6XDqfogXCk=?= <anton@xxxxxxxxxxxxxxxxxxxxx>]

Hi all LAS users:

when I access my new LAS6.0 by http://myhost:8080/las/servlets/dataset, it responds me the following meaasge:

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Session expired

Your LAS session has expired. Please click here to start a new LAS session.
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And after I click the "click here", there is nothing but blank on the IE6 browser. 

Did anyone have the same problem? Thanks for your suggestion.

Anton Chen