I just checked the new 1.4.5 version, but the problem I described above is still there. On a PC everything seems OK, but on my iPhone I get this problem.
I just found out that pictures where "width > height" are all good. Some of the pictures where "width <= height" have the problem I mentioned. The picture is shown with the correct width and height but the image itself is rotated by 90 degrees clockwise (which obviously results in a distorted image). ALL images are a lot smaller than the screen size, which is unexpected.
I have "Shrink large images to fit smaller screens" checked.
Using Firefox, with the Tools / Web Developer / Responsive Design View set to a resolution of 320 x 480 seems to work fine.
Am I doing something wrong? Is there something I can do to fix this?