Same thing happened to me, old password didn't get me in.
I was able to self reset mine last night, with copy and paste of the new password and reset it back to my own password. I was using yahoo for my email and it forum email didn't get into my spam, but took 5+ minutes to get. Still though everything went smoothly. Possible few isolated cases where to auto pass reset doesn't work?
Also another question to ask are people hitting the 5X password limit and trying to self reset and reenter their password within the 15 minutes? Does the forum shut down the account for 15 minutes (meaning you cannot reset nor enter passwords / login / make account changes during the "blackout" period) or does it just deny the IP from making an entry into the forum for 15 minutes?