Hey Bonus Paradise,
I’m not having any trouble logging in. But I’ve had a similiar problem with another affiliate site once, for a year before I finally figured out the cause for my login problem. My Spybot blocked the site in explorer, making it so everytime I tried to login, it took me back to the login page for no apparent reason.
This might not be what’s giving you the trouble. But you might want to check your options in IE and see if CWC is blocked in your Privacy sites or Restricted sites. Just something to check.