Theme Horse

I think its the .htaccess problem not the theme and domain problem.

first make thee backup of your .htaccess and remove the older .htaccess file and paste this code.

# 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

This may work for you
Thank you!