Ok (admin only).
Try this:
While making new topic select "make it a global announcement"
Create the topic
Wait
You will be redirected to the index page with your topic on top
Click on the last poster (which is you)
It will take you to your post.
Now a funny bit
Click on "threaded" button top right (not the bottom right one)
ACCESS DENIED!
Now go one step back with your browser.
This time click on the bottom right "threaded"
IT WORKS!
But hold your horses.
Click on the "Flatten" button
ACCESS DENIED!
I dont care, I am modifying the top button making it identical to the bottom one, then I will think of something for the "flatten" one.