From the media settings screen I've set sizes as:
thumb: w167 h80
medium: w335 h160
large: w670 h320
Roughly all the same proportions.
Crop thumnbnail is selected.
If I go to the post and upload an image which is originally 1200 x 551 the size options offered are:
Why is this?
I tried again, cropping my picture to 670 by 320. I can upload this at full size - but when I use the large image on a page is is reduced to 640 x 305. What's going on here? Is it a bug?