If you google this term and insert your specific browser, you should get directions on how to do it. "how to clear firefox cache". Just insert whichever browser applies.
So I did as you suggested Dom, and now I cannot log in. The screen accepts my username and password. Says thank you for logging in then sends me back to log in page. Any ideas?
Well I got on using my computer. When I logged in the screen still said I was but wasn't. I had a pm though that prompted and I was able to open it. So here I am. Also I can edit again. So not sure what is going on but I glad its fixed or at least not happening.