In that case, could you please PM me with an FTP account and an AdminCP account, as well as create an English language for your forum? If so, I should be able to solve this for you
I found the issue: You've reversed the permissions for the content types. I checked the "New Threads" content type, and you have the "Cannot access" set to Yes for all your normal usergroups, while banned and guests can view it.
Cannot access means they are unable to access it, so you need to flip those permissions around
However, it was a bug that the comments link still displayed even though they would receive a no permissions screen, I have now corrected this on your site
If you fix the permissions as described above, it should now work