Gateway 10.0.7 Customer-specific Spam definitions not updating

Anti-virus and anti-spam are updating just fine, several times a day. Only Customer-specific definitions are failing to update, the main status screen shows they are 17 days old. I regularly go in and submit false positive and spam deletions and we are all set up with a submitter code, so I'm not sure what's happening. No filtering or firewall issues that I'm aware of either. Any ideas on where I can start checking for a solution?