Part of fixing the issue is forcing all accounts to set a new seed pair, in an hour expect to be prompted to set a new pair.
We (bikinidice) change server seed every rool. That's isn't very pretty for player (need to check every time his pair to make sure of our fair system) but we need to protect our investors coin.
Sites like bikinidice which pick a new server seed for every roll are a real pain to play on for the paranoid gambler. In order to be sure that the rolls are fair, you have to make a note of each new server seed hash, and then pick a new random client seed as well - for every roll - and then verify the rolls afterwards, too.
If any player force the sha256 server seed is a BIG problem. Yes it's difficult but not impossible.