I thought there was a restriction still as this is the first post it has let me submit. Tried posting in a thread for dragons tale but it said I was "posting too quickly wait 300 sec" then after that amount of time it still said same thing....
Same with search " searching too quickly wait 120 sec" and when I got those nnoties, it was my first attempt at either..
Actions like logging in or searching will reset the timer.
So, after logging in, you need to wait 360 seconds to make your post. And if you have done a search, wait for another 360 seconds then.
That time limit will be much shorter when you get 15 activity.