Hi Mike here from the AA-Fords forum. The forum software was upgraded on the 25th. The new version changed styles considerably, plus fonts, graphics etc.
When I first launched the site after the upgrade I saw the same thing (circles with red lines), refreshing my browser cleared up the display and I've not had any issues with any of the 3 computers I typically use to access the forums, refreshing cleared it up for each one.
If refreshing the browser (method varies depending on your browser) doesn't clear it up, then purging the browser cache should do it as well. That will remove all cached images, style sheets etc for the old forum layout.