hfp777:
I checked the power rail once fed from the 5V pin and it does output the same as Vin, that is to say around 4.55/4.65 depending on the USB/DC jack combinations stated in the first post.
If you are supplying 7+V to the power input jack you should have 5V on the 5V pin and not some other voltage.
When I power the whole thing up with a 5V 2A AC adapter ...
That doesn't sound like 7V to me.