I was given a bribe by kickoff event and went in for a foul with my thrower. The ref noticed it, but when the bribe screen popped up, it closed almost immediately.
The strange thing is, a friend says he just started spectating the game, and that HE clicked the 'ok' button right away when the bribe screen came up. Could be unrelated, but then again it seems an odd coincidence.
I've heard of someone else complaining their bribe screen timer was cut short, but do not know about any spectators in that game.