I recently got back my 5D3 from CPS after dropping it. Everything was fine until I went to take some macro shots using Live View. Exposure seems way way off. It looks fine on screen, but comes out about 100 times darker than it should. If I take it off Live View and shoot regular, exposure is exactly what I want. Doing this on another 5D3 I don't have this problem.
It seems really weird to me this would be happening, and I'll probably just send it back to CPS for checking out, but I wanted to see if anyone else had experienced this and if they resolved it on their own.