It was impossible to access the forum with Tor for about 48 hours, I tried with various connection settings in Tor, but CF simply did not allow the captcha challenge to pass. Apparently the attack lasted a little longer than usual, but now everything is back to normal.
I'm also a Tor user for mobile; I just tried accessing the forum through it right now, and everything works perfectly.
~snip~
Otherwise, I have no problems accessing the forum when it comes to desktop computers and Tor, but for some reason the mobile version of Tor always has problems accessing this forum. It's like there's some extra level of security that the forum or CF has implemented towards mobile users.