This tells me that you somehow changed the IP address from where you post to the Forum. You seem to have switched over to a new Internet access which was used by spammers in the past and has been blocked. My problem is that I can't figure out which of the 45 blocked IP addresses was the one you used. Please send me a private email outside of the forum, firstname.lastname@example.org
from exactly the same way you tried to log in getting the spam message so I can trace the IP. This isn't at all personal to you, just somebody using the same IP was spamming the Forum at some point.
Also, clear all cookies in your Chrome cache, close the browser and re start before trying to log back in.