I noticed that the LCD shoot settings screen doesn't come on when turning the camera on, holding the shutter button halfway down or after shooting and photo review is just a quick flash. The memory card light slowly flashes constantly until you turn the camera off. I think it happened after I updated some of Canon's other software not the firmware yesterday. I didn't notice it yesterday because the only shooting I did was through EOS on my laptop so I never looked at the camera screen.
This is what I updated.
ImageBrowser EX 1.1.0 for Mac OS X 05/17/13 47.90 MB
EOS Digital Solution Disk Software 28.1A for Ma... 05/08/13 112.48 MB
Digital Photo Professional 3.13.0 Updater for M... 04/01/13 87.84 MB
EOS Utility 2.13.0 Updater for Mac OS X
I can get the screen to come up sometimes by hitting the "Q" but not often. Usually that screen stays black. I have the version of ML installed that A1ex sent me back in May. No nightly builds tried since before that point.
When I updated the Canon software it required me to keep the camera plugged in. That's what makes me feel it was one of those updates.
OK here is how I fixed the problem. I completely removed ML and installed Canon's new firmware.
Everything seems fine now. No ML installed.