Just got my card this afternoon, not had chance to test it yet but will do later tonight.
Took the card out the box to give it a quick check over and noticed a small red ink mark above the LED on the side of the PCB itself. I've no idea what it is, or if it's some sort of quality control mark, or if it's meant to be there (it's a silly place to put it on, if so). I've tried removing as much of it as I can, but it looks like it's soaked into the PCB.
Anyway, will report back later with my testing.
Never noticed it on mine, but checked it and there is one there must be some kind of QC mark.