Error With Incendio Get AD User

Has anybody seen the following error when using the Incendio Get AD User component? It only happens for a couple of user and there AD accounts look ok.

Error Details
Error Message:
Unknown error (0x80005000)
Message Stack:
at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
at System.DirectoryServices.DirectoryEntry.Bind()
at System.DirectoryServices.DirectoryEntry.get_AdsObject()
at System.DirectoryServices.PropertyCollection.Contains(String propertyName)
at Inc.AdLib.AdHelper.GetAdPropertyValues(String[] Properties, String ObjectDn, String AdminUsername, String AdminUserpass)
at Inc.AdLib.AdGroups.GetUserGroups(String Dn, String UserDn, Boolean ShowNestedGroups, String AdminUsername, String AdminUserpass)