Alright, how's this -- Almost every picture from my old nifty fifty lens was coming out way over exposed, except for low light pictures. I was going crazy thinking it was something with the camera's metering. It took me forever to figure out that the aperture was stuck wide open. (The camera was saying that the aperture was closing, but was actually stuck wide open).
Finally figured it out when the "live view" was showing a total black under exposure, while the final image was still over exposed.