The picture has to already be a perfect square to prevent that
Like this
The only time I have had problems posting pictures is when I post a photo I have taken with my tablet. They either post upside down or sideways. Everything else shows up like it's supposed to.
I don't usually post really long images. Maybe there is a maximum height defined. Or it's something with your browser?
@Martin_Stahl: It happens only for a few days now, that images loose their format while posting.
You'll find examples here: Noticed this first on mobile browser with smartphone screenshots 13 days ago:
and in a browser with medals (16:9 the standard format e.g. for announcements) eleven days ago: https://www.chess.com/clubs/forum/view/club-redesign-five-questions-to-jdcannon?page=71#comment-98244513
Here are some examples of cutting an image's top and bottom portions...
https://www.chess.com/clubs/forum/view/tournament-chess-snakes-and-ladders?page=59#comment-97520099
https://www.chess.com/clubs/forum/view/tournament-chess-snakes-and-ladders?page=59#comment-98088467
Hope; this glitch will be fixed soon.
Before longer photos were sideways which was an annoying bug, now they are being cut off and it is very frustrating because some photos of posts get cutoff and now we have to undo our cropping to try to adjust to this bug