Unable to upload media beyond front site

I can upload media to okstateu.com but am not able to at okstateu.com/2010 even when logged in as a super admin. This is the error I get: "Unable to create directory /home/okstateu/public_html/wp-content/blogs.dir/2/files/2011/02. Is its parent directory writable by the server?" I changed the permissions on blogs.dir to 775 and is still wouldn't work. This seems to have been discussed before but I couldn't find a complete solution.

I have my site hosted with hostgator if that help.

Thanks for your assistance.