I know I've managed to do the same in the past myself, but can't replicate it.
Go back to user options, view preferences, and check things are set up, sometimes the drop down boxes can slip to the wrong setting if you drag them before you set them
Then log off. Then kill your ybw.com cookie (do you know how to do this?)
I suspect you have a cookie problem. Try the procedure again, but reboot your computer after you've deleted cookie. Can't think of anything else to try, unless you have security software doing wierd things