Got some more problems with the forum:

1. I always have to login 2 times.
2. Signature isnt shown.
3. Pic isnt shown. ---> ERROR
4. New posts are not marked for me.

That´s it i think

What link are you using? If its anything other then http://forum.specialattack.net, then you should change it to that. If that doesnt work, clear your cookies.
You dont appear to have any signature set in your profile. I've set one for you, try and make a post and see if its showed. Also make sure that you have ticked the box infront of "Attach signature (signatures can be changed in profile)" while your posting a message. Can you try upload your avatar again? I made some changes to the server so you need to test this for me please.
See question 1.

Thx for the help:

1. Now I only have to login one time
2. With this post I try.
3. Pic works.
4. There were no new posts so I ll try this later.

Edit1: Signature works
Edit2: New post are shown

In effect everything works how it should.

excelent