EOS 40D, happened last night while shooting a time-critical event: autofocus just stopped working and I was unable to shoot. Had a brain cramp, so I grabbed my backup Rebel to finish up. Found today that the 40D will shoot fine in manual focus.
Had this happen 6-8 months ago, and I was able to clear it up (it seemed) by removing the lens and cleaning the camera body contact pins and lens contacts, but it changes nothing now. Doesn't make any difference what lens I put on (tried 3 last night during my frenzy!) - none of them worked, so appears the issue is in the camera, not the lens. I've done a "clear all camera settings" just in case I inadvertently did something crazy, but that changes nothing.
We're many miles from a Canon repair facility; I'd like to solve this if I can. Any ideas for me? Thx!