Okay so I tried playing some KW online, except I was prompted with "the user has entered an invalid password", over and over. Thing is, it's not the wrong password since I appear to be on this forum fine and it also worked with C&C, RA3 and C&C4.
I tried changing my password, got the confirmation e-mail so everything's good to go. Except it still doesn't work with KW, now it won't work with C&C3 or RA3. Anyone got any ideas?