What program are you using to rotate it before you upload it?
Some programs, like for instance Google Picasa, allow you to rotate the image and it displays fine inside Google Picasa but, it doesn't automatically 'save' that rotation back into the file, so it hasn't actually rotated it for any other programs.
You have to make sure you have 'saved' the rotation back to the original image, in Picasa that means pressing CTRL-S once you have rotated it...
Rob.
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