Yes, on 9/29 I got the same message when I tried to log on, and I received this e-mail from FT:

"Dear Top Tier,
Someone has tried to log into your account on FlyerTalk Forums with an incorrect password at least 5 times. This person has been prevented from attempting to login to your account for the next 15 minutes. The person trying to log into your account had the following IP address: ***.**.***.*
All the best,

FlyerTalk Forums"

I wonder, does FT check to see if the IP (which I've redacted) belongs to another FT'er?

I tried a "whois" inquiry and it comes back as belonging to IANA (Internet Assigned Numbers Authority)

I can't think of a reason why anyone other than another FT'er would want to log on to my account.