I have no problems when I press +/- to pan-in/out
It seems that to you those keys are assigned to Zoom-in/out instead of Pan..
Press numkey 5, then try to pan-in/out by using the Custom Pan menu item (Shift+O by default)
Otherwise press M key, it's Movie mode, it should remove black borders the way MPC removes them with 9 key
Check also the Key definitions in BSplayer Preferences (CTRL+P), both normal and full screen tabs
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