I just recently switched to Windows 10 from Windows 7, and my photos when posting to any forum were being posted rotated to the left -or sideways. This was due to setting Photo Gallery as default photo viewer. Windows no longer supports the 2005 SQL server that supports Photo Gallery. Thus the sideways Photos. to correct this I went into Control Panel and and set my default photo viewer back to Photos (viewer and editor for windows 10). If you are uploading photos from a cell phone don't upload from Photo Gallery or yer pictures might be viewed sideways. It has something to do with your camera's flip ability to go from portrait to landscape, and will upload all portrait pictures as landscape - thus sideways. I hated to change from Photo Gallery to Photos but I hated a turning my head sideways trying to see the Pictures on the forums.