After some brief difficulty upgrading from Civi 4.6.x to 4.7.0, we managed to get it done, with one small hiccup. Post-installation, we got a notification saying:
File 'Array' presents a security risk and should be deleted.
I looked in our CiviCRM directory, and found 2 files called "Array.php" I tried temporarily relocating both of those files, but no luck; the error still displayed. Any leads as to how to resolve this issue would help--it makes me uncomfortable to have the system status as "Critical."