- compiled for WIN x64 . My PC is a i5 661 with its internal HDGraphics !
Also in the former Version I have seen this problem in showing VERTICAL JPG in Fullscreen (on this x64 version / I think maybe also on other platforms).
I am using a Photocamera with its special chip for which you can select different formats of the picture. 3:4 / 2:3 / 16:9 !!
Having a photo in 3:4 vertical !!! - it gets a "BLACK horicontal line" at the lower part of the picture ! (see pic 132 +147)
In case of 2:3 - the picture is perfect - without this line. (see pic 130 attached).
SENT TO YOU BY MAIL !!!!!!
This black line is ONLY shown in xnview MP. If I use irfanview or the internal MS viewer - the pic is ok

Maybe a chance to fix for next version
