Both the shutter and mirror open and stay open, you can see the image CMOS sensor and it locks open. It's not a setting, as I have reset it to factory settings and it does it in every mode (except video). Even if you are in full manual and set the sh...
I have the same issue with my EOS T3, however when you put the camera into the live view mode (where you see the image on the screen prior to taking the photo) there is no problems taking a picture. The issue seams to be when you view through the eye...