Originally posted by LouD One of the round contacts on the lens mount, the third one from the right, appears to be slightly depressed, more so than the rest. Not sure if that has anything to do with the problem.
You have guessed it right. This is the "A" pin. If it doesn't have good contact with the body mount the camera thinks the lens is an old pre-A lens.
It looks like the problem is with the two lenses. Not much you can do without taking apart the lens mount. Also please make sure the aperture ring is firmly set to the "A" position.