I can only repeat and confirm the problem is surely related to cookies, and it's on your end. Multiple users that asked about this by email in the past few days, all confirmed that removing cookies from fsdreamteam.com from the browser, fixed their problem.
It's possible this might be another one of the usual very creative ways security products have a way of interfere with your system and, for some reason, decided to block or made invalid the cookie of our site.
Please follow my suggestion *to the letter*, which means removing all cookies from fsdreamteam.com. Not
www.fsdreamteam.com, but *everything* from fsdreamteam.com, that's not the same thing.
As an alternative, try changing your password. Maybe there's some kind of new creative security related product out there, which "ban" your PC if you password doesn't look to be strong enough.
This is not anything we are doing on our site. It has been years since I had to ban someone.