When I mount the flash on on the camera itself, everything works fine, as it should. When I attach the flash via Shoe Cord 2, strange things happen. Shooting in aperture priority and manual flash mode, the shutter speed locks in on 1/250 and doesn't change, regardless of the aperture or the ambient light. Shooting in ETTL on the flash with the cord, the shutter speed varies as it should. Manual flash mode and the cord seem to be causing some problems. Any suggestions?