Evan,
I agree with you.
Now look my 5v regulation of my Arduino. It's the same that on V5, V6 etc.
The test to do is to connect the USB port of the Arduino to a pc, and do not put power on the Ubitx.Me, I have the impression that the 5v of the arduino goes up on the "out" of the regulator and therefore gives + 5v on in fact the "in" of it.A diode should be put at the output of the regulator towards the 5v of the Arduino.Made? the test to.? ? I'am not crazy.....Lol
Here my Sch¨¦matic, it's the same on V5, 6!!
So the good modification is:? ?OR MY REGULATOR DON'T WORK ?? NOT SURE!!

Current Schematic:
