Try doing these BPS troubleshooting steps below and let me know if the problem is still occurring.
http://forum.ait-pro.com/forums/topic/read-me-first-free/#bps-free-general-troubleshooting
2. On the Security Modes page, select the Deactivate Root Folder BulletProof Mode (Default Mode) Radio button and click the Activate|Deactivate button.
See Custom Code Note
3. On the Security Modes page, select the Deactivate wp-admin Folder BulletProof Mode Radio button and click the Activate|Deactivate button.
See Custom Code Note