Plugins and Themes pages not showing up

I was getting an internal service error when I clicked on plugins and themes from dashboard, so I opted to delete the entire installation of wordpress, since it was basically blank anyway.(I had only initially installed a week ago.)

I uninstalled wordpress, deleted everything in the addon domain folder, and then uninstalled the addon domain using cpanel. I followed that up by re-setting up the addon domain, and reinstalling wordpress.

So, this is a brand new installation of wordpress on a brand new addon domain.

theviewfromabove.net

Every time I click on themes or plugins from the dashboard, I get a generic post page within the twenty-thrteen theme. I’ve cleared my browser cache. Also, if I try to install the wordpress importer, it opens the homepage of the theme in lightbox/browser instead of the normal importer install page.

I have a feeling that this has something to do with the .htaccess file, but I’m not savvy enough to figure it out. Currently my htaccess file looks like this:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ wp/$1 [L]
RewriteRule . index.php [L]