Cannot login to PeerReview Complete server immediately after installation

I installed PeerReview Complete on CentOS with MySQL 5.1 and with LDAP. I completed the install but at the login screen that appears at the URL, I cannot login. I have tried the default "admin" username with a pswd of "admin" and with no password. I have tried my domain username and password, also without success. Any suggestions for trouble-shooting this issue would be appreciated!

Thanks, George