Log in using the email address and password you selected when registering in-game. Forgot your password?
(First person is still a little broken for reasons unknown. I am not a technical artist and there are some ancient bits of code down in those systems that never get touched anymore.)
If you want to scientifically test it you should use a program like FRAPS to record and count the number of frames from the first mouse input being received to the time the part appears to be fully repaired on the UI. Timing it by hand is not precise enough to notice any differences at the time scales this fix might still be iffy. The animation however is still pretty broken and that can significantly affect perception of the problem. That and the fact that rapid clicking was ingrained for years in people's minds and you get the result of people still doing it. Hell I still do it and I fixed it!