Tony, no it hasn't just started. It happens every so often. I spend about 15 minutes trying different things, then give up and wait until the next day. I'm not sure how to go about "clearing cookies". First of all, some of them I really don't want to clear because they are helpful. Second, these days they have cookies spread out all over the place. Trying to find all of them seems like a daunting task. I'm not too sure what you mean by "refreshing" the display ... you mean click the "Reload" button?? Worth a try. But I noted that when I can't input on one sheet, I can't input on any of them. The "Send a Private Message" area seems quite different than the typical forum thread sheets, but it closes down too.
These are just "for what it's worth" comments.