issue #237 - when manually changing an uploaded photo URL in a post to an invalid URL that happens to not throw an error, it affects the ability to parse the URL to see if it's a local image and correct permissions. The correct way to do this is to change the '-2' to '-1' if you want 640 instead of 320 and '-0' if you want the original size - which is not likely to win you many friends if it happens to be a 42 megapixel photo. We might have limits in place to prevent monster photos from destroying everybody's streams, but many services you export the post to will probably not.