I've got a Witespy Pro Ez3.0 (multiwii black (no MAG)) and I'm having an issue with my octocopter sketch..
When I first installed the mutliwii, I powered it up and it activated every other motor (as I would expect) since only the left ESC port would be activated.
I then opened the MultiWii_ black gps sketch, commented out QUADX and uncommented OCTOFLATX. Compiled and uploaded.
While the first ESC connections work (bottom left), the second ESC connector (on the bottom right) still does nothing. So I only have half the motors turning on.

I also did Examples -> EEPROM -> eeprom_clear sketch and then reflashed, but still didn't go anywhere.
Edit: MultiwiiGUI always shows 4 motors on the 'Realtime Data' tab.
Edit2: I tried HEX and QUADP, but MultiWiiGUI always says QuadCopter X on realtime data screen.
Edit3: When I swap ESC2 cable with ESC1, the other set of 4 motors activate and run as expected. So this isn't a wiring issue on my side, It's just the ESC2 port is not activating for whatever reason.
Edit4: Should the second ESC connector also be connected to ground/power, or does it not matter?
