When I upload horizontally-oriented images to my posts, they display fine, but if anyone clicks through to the media page, the only thing that can be seen is a bar of the image, rather than the full image. (There is no problem with vertically-oriented images; they work fine both in posts and on the media page.)
The site in question is: http://hermitina.com/
And an example of a media page that's not showing up properly: http://hermitina.com/2012/01/17/patagonia-vi-january-10-2012-calafate-berries/img_0442/
Forgive my relative inexperience, and thanks for any suggestions!