Hi Jim,
If you make any changes to the LDAP configuration, you will need to also bounce tomcat. As Christophe suggested, check the $SPECROOT\tomcat\webapps\spectrum\META-INF\context.xml, and SPECROOT/tomcat/webapps/spectrum/WEB-INF/web.xml files, but be sure to bounce tomcat after modifying the LDAP configuration page in OneClick.
Thank you,
Brad