there is a white line on the top and on the left side of the screen
the same problem have my friend but oposite-on the bottom and on the right side
we cannot fix this problem
ATTN ! ONLY ON FULL SCREAN AND ONLY ON LAST VERSION OF BS PLAYER

Untill this is fixed, you could avoid annoyance by using borderless play window. In full screen mode your (2) borders will be vanished too:
right-click > Options > Preferences > Video and then check (=select) "Borderless play window"
(You will have to close the movie file and load it again before the new setting will be active)

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