MemoryCoin 2.0 has a serious problem with difficultly yo-yo-ing from very easy to very hard. It's better to resolve this problem sooner rather than later, so I'm going to be releasing new code for this problem within 24hrs. As its a new coin and most users will still be heavily engaged, I don't think we'll need a long period of adjustment - maybe 24hrs, so please keep abreast of developments here.