You can also just edit your .htaccess properties to 777, save a page of WP Better Protect, and put the properties back to normal. Check your .htaccess again, and it’ll be modified.
From the WordPress team:
Thanks for getting in touch, and I’m sorry you’ve had this problem. We’ve received several reports about this error and our development team is currently looking into it.
We’ll be back in touch as soon as we have any further details.
I’ve edited my post, with the text in English.
