It looks like server/Wordpress misconfiguration and I might not help here. However I can take a look. Please send me temporary access to your WP. Send it here on forum via private message(click on my nick and there you will find option "Send Air a Message"). In message please attach link to topic it applies to.
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It is either peramlinks seetings or some .htaccess misconfiguration. Have you installed this on fresh Wordpress?
With regards.
How I can send you access that you check what's wrong?
Please send me temporary access to your WP. Send it here on forum via private message(click on my nick and there you will find option "Send Air a Message"). In message please attach link to topic it applies to.
With regards.