Hi Patrick,
Weird and sorry to hear about the problem. I'm one of those whose holdings is affected. I had 10,000 Gold Fields shares and sold 5,000 yesterday. Then I sold 2,500 this morning obviously after the problem arose. My holdings now shows as 2,500 which is correct but the sale of 5,000 from yesterday has been lost. Not sure if this affects the PnL reporting either because that looks a little overstated for me too.
Good luck and thanks for the efforts in keeping this site updated and so efficient. I'm sure I speak on behalf of all of us in saying that.
Cheers,
Bevan