I suppose you tried all of the above (especially depressing [5] on numeric keyboard).
Then you could start by giving some mimimum information, like which version of BS.Player you're using and its build-number and also what OS you're using. If Vista or 7 it could well be a(n access) rights/privileges problem (UAC). Are changes you make in settings 'remembered' by BS.Player ?
Further verify/check your Pan-scan settings under
(rightclick )> Options > Preferences > Playlist
(If you're using old-style playlist, you may also do that for each individual file in playlist.)
Also you might verify setting of "Remember movie settings" under
(rightclick )> Options > Preferences > General [General settings].