We've just upgraded the forum software (31/07/2017) and if you haven't logged in for a while, you'll probably need to re-login. Some small visuals have changed, and if you're having any issues with visiting the site, please first clear your browser cache before posting your issue here in the official upgrade thread. If you can also then post your device, Operating System and Browser details, that will help us to help you.
If you switched back to the old blue Theme during the "bedding in" process when things were behaving oddly, you can now switch back to the new Theme, by visiting the bottom of the page, clicking Theme, and choosing Dimenson 4.2 - ipsfocus from the menu.
Most of you should have no problems at all now, but as always with a minor version upgrade, there can sometimes be niggles that need fixing due to the customisations we have installed to enhance the forum's usefulness. 
Mike.