There's a flaw in the way the Bitcoin protocol distributes objects which can be used cause mischief with a PoS (and hybrid PoS/PoW) coin that has low PoS difficulty. I won't go into further detail, other than to say I have discussed it at length with Sunny King and for a popular coin like PPC is unlikely to be possible, but for the quieter coins it is of more concern. I can't see any easy way to fix it.
I'd be glad to know more details about this issue. Would you mind to share some info with me perhaps via PM if you prefer?
There are so many coins with low PoS difficulty. Therefore even there's no easy permanent fix, we better come together to find a way to at least minimize the possible impacts it may arise