They wanted to make the arduino uno fcc approved? so they used octagonal pads for vias? If my knowledge is correct then these edges can make more noise then a standard round via.
I dare you to attempt to build a bare board without looking at the eagle files to see what pad goes to what.
Return it. Seems "defective" to me.Where did you buy it?
What bare board? You can get an official Uno Bare Board ??Where DID you get that bare board that you photographed? Are the PCB shops already leaking pirate boards?
Your knowledge on this is not correct, It is simply wrong.
From a reparable reseller on Arduino's approved vendor list (whose name I won't say as i like their products)
But i do remember reading that at very high frequencies the traces on circuit board act like transmission lines and that sharp points on traces tend to act like an antenna the closer the point is to a right angle the higher the antenna effect.