I have had the same problem since the THL increased it's image size thingy. I use an Ipad, so I've found if I take the image & rotate it, so it's not the right way, save it, then take that image & rotate it back to the right way & save it again & then it works......
I hope that makes sense. There's probably a much easier way round it, but I'm pretty stupid, so for now this arse about face way works for me.....;-)