We need Facebook authorization to log you in. We use it as a simple login option, and we never publish to your account without your explicit request.
Login with your personal account, even to manage business pages.
(no worries, that's just the way Facebook does it).
In Facebook, from the menu in the top right corner:
Click "Settings" -> "Blocking". Make sure Symphony Tools is not blocked.
Try accessing this page from a different browser. If it works, then there's likely a browser extension that might be causing the issue.