Hi,
I have tried this mission again (with the camera on the back), and there are still issues. I can get close enough for the APXS to start irradiating this time, but after it gets to about 1/4 of the way through the measurement, the measurement stops, and when I start it again I get the same error message "No target in range". I have to reverse the rover into the rock again, which results in the same bug stopping the measurement. This happened about 4 times before I reported it.