Sorry it's taken me so long to respond, but I didn't get around to re-checking the mod until now. I double-checked the hacks and they were all done correctly. But for some reason I had the permissions of the modlog directory set to 755. Changed them to 777 and everything's working now.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.