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The attached picture is displayed in MediaPortal lying on its side.  First it was lying on its left side, then I used "Rotate 90º" in the context menu and now it is lying on its right side.  If I call up "Properties" from the MP context menu, it displays upside-down!  In IrfanView, Firefox, Paint and Windows Photo Viewer it displays correctly.  What is going on, and how should I fix it?