Re: MPLAB X v5.10 'Power target circuit from ICD 3' doesn't work
Just noticed the same myself; trying to program a PIC18F14K22, behaving as though target power was turned off although it was certainly on in project options. Programmed fine with external power to the target. And then programming a PIC32MX, the opposite - it said target power was on, although it was turned off in project options.
I did have multiple projects open; on closing all projects and then re-opening the PIC18 one, target power option worked correctly again. I generally have external power available anyway so I didn't pursue the issue further.
Still using 5.10 until I see any great advantage in changing to 5.15.