Hi Ken,
Could you please check if pins Vcc and Vbatt are swapped on Proto2, Rev 2? Might also be valid for Proto3. Proto 1, Rev 4 is definitely fine.

Best regards,
Alf

Hi Alf,

Yes, you are right, not sure how we didn't catch this earlier.  It's actually the silkscreen being labelled, Vcc and Vbatt are swapped on the labelling.   Later versions of the Proto2 board were relaid out, and are marked correctly. 

Thanks for catching this!

Ken
TinyCircuits