Can't login to the site on the forum sub-domain

Hey guys, so on my primary browser (Chrome) I can't login to my account on the forum subdomain at all.

When I login to my account on the normal website URL everything works fine but as soon as I switch to the forum subdomain I am immediately logged out.
Inside the forum subdomain, when I try to press 'login' the page simply refreshes and nothing happens.

This is probably an issue with Chrome/cookies.

Currently writing from Internet Explorer, a temporary workaround and not very ideal :P

Thanks in advance guys.