log in problem

The first thing you should know is that I'm currently on another PC then mine. But here we go, since a few weeks I'm having problems with logging in to the crossfire site. First I couldn't login on crossfire.nu anymore and a few days later I couldn't login on xfire.be anymore :< It's not because my login or pw is wrong, it seems like it's just something with my pc (cookies are turned on afaik, since I didn't change anything to my internet properties)
Please help me out!

grtz your master