[xwiki-users] LDAP worked for awhile but problem arised - LDAP/AD issue or something else in xwiki 1.3

Hi list, My setup with LDAP authentication was kind-of working for the last several days (able to login with/without using work arounds). Today it stopped working for one account (bleung). a user's profile resulting inability to logon. I actually see the login registered on the top right of a xwiki page, but actually you're not (navigating away from that page and the login is gone). The error message mentioned something about: 1. Exception while saving document XWiki.bleung (bleung is login name) 2. Exception while saving property tags of object XWiki.bleung 3. Illegal attempt to associate a collection with two open sessions Attached is the xwiki log file generated with the following steps: 1. reboot 2. clear firefox cookies 3. start tomcat 4. goto local xwiki homepage 5. logon using LDAP credential 6. goto local xwiki homepage again (and login status disappeared from UI) 7. shutdown tomcat Anyhelp would be appreciated. My setup: xwiki 1.3 final Windows XP Pro Oracle 10g Tomcat 6.0.16 LDAP authentication (AD)