Using available light (no flash) with shutter speeds of 1/1600 or higher, parts of my images are blacked out (like the mirror is not moving quickly enough). The black area grows with faster shutter speeds. This occurs in any mode (AV, TV, M) or ISO when shot at 1/1600 or higher. Problem occurs with multiple Canon lenses (85/1.8, 70-200 2.8L). Dealer had no clue. Sent to Canon support, who, after three weeks returned camera saying they had fixed it and if the problem persisted to "send the camera back with a lens." (did they have no lens handy to try on the camera?). Go here for images + exif: link to images Based upon other suggestions, I'll add: no foreign objects exist in the camera - verified by canon usa I'm not using the flash (as said earlier). The Rebel still does not work. Ideas?