I’d check the htaccess file to see if is like the recommended one by WP:
# 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
(See https://codex.wordpress.org/htaccess )
I’d also check the ‘options’ table for the two instances of the site root domain (something like http://www.example.com ). Check that also in the admin Options, General page.
You could also use Firebug debugger in Firefox: use the “Net” tab to see the requests made on loading the page. Click on the first entry and then look at the “Response” tab for possible clues.
Good luck!
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