I spoke with ADVFN about the same problem today and they are investigating it.
I hope no one has hacked the site otherwise criminal proceedings could follow.
Your comment "Is more often the case, remember the MM's have a huge advantage in knowing what future sales are likly to be because orders are often placed a while before they are filled (which is basically what VS said) The poor old PI can only second guess whats going on. This is often the basis for ramping and de-ramping on these threads IMO...."