This happens ALL THE TIME. I try to watch a video in full screen and this thing on the bottom pops up and doesn't go away. The only way I've figured out to get rid of it is to un-full screen and scroll up and down and re-full screen, or not watch in full screen. The former only works sometimes. From what I can recall, it only happens in the NS player.
Sometimes quoting doesn't work. I tried to quote SDrvper in this thread, but it says the quote doesn't exist.