Next time, do NOT hit back. Close the browser window and reopen your user CP. Sometimes the updates take but the refresh doesn't happen, when you hit back, it negates the changes.
Notices
This Friday, Saturday and Sunday (November 13th - 15th), beginning at 12:01am Eastern time each day, we will be taking the forums down for several hours. This is in order to run checks and service on our new vBulletin databases. We will be back up by noon each day, though we might be able to open up sometime during the morning if things go smoothly.
I'm running into this problem still, even after the updates. I can't edit my threads per page, etc in the User CP options.