You know what's kind of crazy is they're not always the same size... either from photo to photo or view to view. They're all photos from my iPhone so I imagine they're all the same size, but they'll be different from post to post and then the next time I look at them they're smaller - and the last few when I look at them on my phone, they're sideways!
Anyway, the one thing I know I do differently is I uncheck the little box. That way someone who's not a member can also see them, because yours shows up as _DSC0583cRS.jpg if you're not logged in, and the photo if you are. Just like with Jack's photos. So try posting it again and unchecking the box (the post image box, you'll see it's pre-checked and you have to manually uncheck it) and see how big it comes through, maybe?
Other than that I don't know - and I just checked and on my phone the last three photos I posted are sideways. :chuckle: While on here, my laptop, they're going the right way.