If you're experiencing any error messages on our Forums or Blogs today, please try clearing your cache and re-starting your browser. Hopefully that should fix it.
Sorry, Mr Clough doesn't do 'what's a cache for?' questions, for fear of scandal.
Basically your browser stores pages and their elements so they reload faster next time. You can clear it by, for example, using 'Tools > Clear private data' in Firefox, or 'Safari > Empty cache' in, umm, Safari
On windows vista press F12 on your keyboard a box comes up & cache is a the top of the page, click on that, you then have the option of clearing your cache.