Mike UK: Not sure if it is a site issue,browser issues, user cache issues, or even users ISP cache issue - but a quick suggestion if you happen to notice it happening again, try to refresh the browser to see if it will fix it.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)