Sounds like there is some bad/invalid code that has been added in one of the BPS Custom Code text boxes. When you return do these steps:
1. Go to BPS Custom Code and cut (not copy) all of custom code in any/all BPS Custom Code text boxes and save that custom code in a Notepad text file on your computer.
2. Click the Save Root Custom Code button.
3. Go to the Security Modes page, click the Create secure.htaccess File AutoMagic button and Activate Root folder BulletProof Mode.
