I can flash my core w/dfutil and the current firmware, v0.2.3. I can then use Tinker to blink D7 or PWM set an LED on a PWM pin.
When I try to flash the blink example (or any other app) from the IDE I get a somewhat long set of Magenta flashes, pause, more magenta flashes and then my core goes to flashing yellow. I’ve tried resetting the factory firmware via the pushbuttons but it goes from white to flashing yellow. The only way I seem to be able to recover is to reflash via USB.
Am I missing something very obvious here? Or is this a bug or a defective core?