Unfortunately as part of our ongoing site upgrades we have had to remove our support for linking external Steam accounts. If you are unable to login using Steam, please use the username/email address associated with your account to request a new password to login with here.
The issue is related to our lazy loader system (only loads images as you scroll down the page, rather than all at once upon initial page load), which has been disabled whilst we looked into this. Looks like there's no easy fix (it's just incompatible with Safari), so we're just going to have to leave it disabled completely for now.
Going to mark this as fixed for now, but might be something we look into again later.