XF 1.0 Permission problems when creating new posts

I have successfully installed my XenForo copy, and actually I am creating new threads in my forum. However, when I try to create a new posting with copy & paste from one of my blogs I get the following error message:

The following error occured:

Forbidden:

You don´t have permission to access /forums/lumapower.20/add-thread on this server.

The strange thing is that I did not change the default permission. I got this message several times, but not each time when I create a new post.

BTW: I am using XenForo 1.0.4, and my forums are here. I am logged in as administrator.
 
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