I had the same problem until I figured out how to rotate images "properly" in EN for Win. The wrong way is to select the image, right click, and select rotate cw or ccw. This method takes forever and converts the JPG to PNG. The right way is to double click the image which should bring up your default JPG viewer, usually Windows Photo Viewer. Use your default viewer to then rotate the photo. At least that's how it works for Windows Photo Viewer. I was not prompted to save the file after rotating it, it just showed up oriented correctly in EN as a JPG, and almost immediately.