black bars in BSPlayer

I use mostly BSPlayer to watch anime and everything else. I use Zoom Player and some other things once in a while, but mostly BSPlayer. Yesterday, black bars suddenly started appearing on the top and bottom of some files, like they would if you were watching a widescreen movie on TV. How can I get rid of these bars? They weren't ever there before, and I don't like them. I've looked around is BSPlayer's preferences and did a Google search for help, but I just couldn't seem to fix it.

Any help would be appreciated, thanks!

its called letterbox. that means your vid file is originally come from a widescreen source.