AD Passthrough failing

We are on V.7, B7009.

We have been using AD Passthrough without fail since we upgraded to V7 a month ago. Today we were unable to scan an individual workstation, so initiated a full asset scan.
After this process started, there was an issue that caused the process to abort. As a result, our AD Passthrough has been failing.

With Enable AD Auth, and Pass-through Auth enabled, browsers are constantly refreshing to j_security_check.
We can Disable the Passthrough with no change. Then Disable the AD Auth and we are prompted for login, but cannot login. We then re-add the AD auth and can log back in with out AD credentials.
We have did "Import Requesters from Active Directory" again and re-added the pass-through option, ut no change.

We have disabled and re-enabled the Engine with no results. Restarting the server at this time of day is not an option.

Tech support will be calling us back, but since we don't know when that will be, any ideas from anyone else out there?