Wow, I'm impressed! Your first digital camera so you went from 0 to two 5DM3...
This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
There are likely other settings involved, I'd save the settings, and then reset the camera to see if the problem goes away. Then restore the settings and see if it comes back.
Does it bother anyone else that he thinks f2.0-f/2.8 is 3/4 of a stop and f/1.8 to f/2.8 is a full stop
If you manually clean the sensor for at least 30 seconds (just enable manual cleaning dont actually have to touch the sensor) it will detect and map out dead pixels. At least it does on my 60d. Im pretty sure this is done prior to getting a new camera, dead pixels are like dust- you will eventually have some no matter what