My Setup:
Quad, Pixhawk Clone (v2.4.6), MP v1.3.74 bld 1.3.756327684, Copter legacy v4.0.5., APC props and plastic frame, Taranis X9D+ TX, Taranis X8R RX (SBUS from RX to Pixhawk clone).
It seems that every time I complete a flight test, download logs, and then clear logs, the logs do not actually clear. Even though I give it 30+ seconds, and MP says the logs are cleared i.e. no logs to down load. When I down load the next time I see older logs that I had cleared. Anyone have an idea of why this may be happening?
The temporary answer is to leave all the logs on the SD card, starting with 00000001, or eject the SD card and manually perform operations directly in a computer.
The fix is in 4.1 DEV so hopefully we get that soon.