Thu Mar 03, 2016 5:49 pm
Can't say I have an answer, but what are you viewing them on? 'Large' is normally 800 pixels wide, which may nor work so well on some phones or tablets, for example. Large will default to 800 wide, or the uploaded size if the size is less than 800 but bigger than 'Medium' (400). Have your other pictures been uploaded at 800 or wider?
In the Firefox browser one can right click on an image and do a "View Image Info" which will tell what the image size is from the server and what it's scaled to in the browser. If you can get that info from whatever you're are viewing with, it might point to something.
I am not aware of a setting to pick the default size on an individual image or gallery basis, and in a quick look I don't see one, but the 'Help' info leaves a bit to be desired. Maybe someone else can chime in here. (I'm thinking setting that default has been a requested enhancement somewhere along the way.)
DaveT