I have been using back button focus (using AF-ON button) since I got the camera 13 months ago, in both live view and through the viewfinder. Two days ago it stopped focusing in live view with the AF-ON buttion, but continues to focus through the viewfinder. Changed batteries, lenses, and even reset the camera but it will not focus in live view with the AF-ON button. Touching the screen in live view will generate the focus cycle.
If I change A8 to shutter/AF-ON, in live view it will focus with the shutter but not the AF-ON button. I can assign focus to the FN1 button, and it will work in live view...and may even be a better choice when using live view since my finger rests near there naturally.
I mostly shoot through the viewfinder, so it won't stop my activities but have to wonder if this is the beginning of a more serious problem. Has anybody else experienced this?
Firmware version: C 1.11, LD 2.018
Thanks in advance for any insight.