Liferay LDAP issues

Using Liferay 4.3.3 in Tomcat, authenticating against MS Active Directory. I was having a strange problem... only one user would not authenticate, and was throwing "...Problem accessing LDAP server: Unprocessed Continuation Reference..." All accounts were importing and working perfectly. Using JXplorer and comparing accounts, I found that the account in question did not have an email address associated with it. Without an email address, Liferay will not authenticate... at least with the typical config.