My question is I'm not sure if this might be a USN rollback issue. Should the DC1 and DC2 have the same USN numbers? I could be way off, but thought they are suppose to match. This is only one site with two DC's both in the same domain. There are no replication errors, but we are having issues where some people are not able to login to resources, while others can....
repadmin /showutdvec DC1 dc=domain,dc=local
Default-First-Site-Name\DC1 @ USN 2289458 @ Time 2012-09-20 17:31:28
Default-First-Site-Name\DC2 @ USN 4392190 @ Time 2012-09-20 17:31:23