Error starting integration builder from client pc

Hi,

After logged in to pi 7.3 server I am trying to launch integratin builder but getting this error

#6 11:32:44 [AWT-EventQueue-2] WARNING com.sap.aii.utilxi.swing.framework.personalization.persist.MuffinResourcePersistor: No muffin found - probably this is the first run after a WebStart cache refresh or the first run at all.

Thrown:

java.io.FileNotFoundException: http://****************:57600/dir/ibdirCLIENT_SIDE_AutoCompleteUser_preferences.xml

I have tried with serveral version of jre 1.6,1.7 but nothing seems to work . Any suggestions what is wrong with my pc?

reagrds,

7Z