I am using WP 3.7.1 and something is really wrong with my site. I have suddenly lost all my site’s design. When I try the Live Preview on any theme like TwentyTen, TwentyEleven or TwentyTwelve I see no styling at all. My images are showing but without any thumbnails and when I try to load a new image I get a 403 Forbidden error stating that I don’t have permission to access the /wp-content/uploads/2013/10/myimage.gif on the server.
What should I do?