Error 404 after updating to 3.5 and Error 403 on Dashboard

Hi

I posted earlier, as my server had automatically updated my website. https://www.maverickartspublishing.com but have had some further/different problems now.

First of all I couldn’t access my sites at all. I had to change the permissions to gain access.

Then once I got in I was prompted to update my database, which I did.

Then as you can see my site is not showing any pictures (or anything). Even on the dashboard the WP logo is missing from the top left corner. On the website the error log says:

Failed to load resource: the server responded with a status of 404 (Not Found)

On the dashboard, the error log says:

Failed to load resource: the server responded with a status of 403 (Forbidden)

I have looked at the master 3.5 post thing and have:
-Changed/updated the permalinks
– Looked at the .htaccess and have this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

– reinstalled 3.5
– Tried the Twenty-Twelve theme, but no change
– Contacted my server (Dreamhost) who seem to have had problems earlier today, but they are now resolved, but probably not related as didn’t have any effect on my website. They have not replied.
– I tried reinstalling with the most recent version of my theme. No change (so reverted back to old one).
– Disabled all plugins. Then I deleted them one at a time to see if any change and was none. I have very few plugins anyway.

And so with my very limited website knowledge…i’m stumped. Any help would be greatly appreciated.