The same thing happened to me a day or two ago. I had changed my IS password and logged in successfully. After a few hours I used Deep Meta, forgetting to change it to the new password. The program informed me that the login info was incorrect and the account was temporarily locked. I was then unable to login to IS using the web either.
I tried the password reset facility and it simply took me to the IS front page, not to a reset password screen as promised. At this point I raised a support ticket and went to bed.
The next day I was able to log into IS normally using me new password. However using Deep Meta (possibly with the old password again, I'm not sure) provoked the same account lockout message.
I left things a few hours and was able to login normally again later that day (yesterday). I also go Deep Meta to work, being careful to make sure it used the new password this time.
IS support eventually sent me an email with another link to the password reset screen, which would have worked had I chosen to use it.
Extrapolating from the above posts and my own experience, without any hard evidence of where the problem lies, the most I can say is:
a) The problem is not just limited to any one contributor
b) Changing passwords may be part of the problem (though that may just be a red herring)
c) Using Deep Meta with an incorrect password may be causing a temporary account lockout.
Hope this helps to shed some light.