We have recently upgraded to WAS 640 SP12. Since that time user mapping has not been working for us. We have verified that the ume.usermapping.unsecure option is set to TRUE. We have also verified the SSO ticket using a small program 'SSOSupport.par' which will gives the portal logon id and R/3 logon id. The results were that they are both the same even after User mapping is done.