No visible cathegory

Hello all,

I just created a forum and I added some cathegory with forum and subforums. But somehow i can't see those cathegories in the normal forum. I mean i see them in the admin pannel and the link also seems to excist. I'm sure you guys have heared this question for a thousand times but i can't find the solution. I have used the tutorial and I saw that the cathegory can't be empty but i thing it isn't empty. Does it need some time before the new structure (cathegory-forum-subforum) shows up?

Thanks,

Lord Arogandor