Most likely it was 51% attack like recently in BottleCaps.
But I also found this in official code:
Old and good parameters:
static const int64_t nGenesisBlockRewardCoin = 10000 * COIN;
static const int64_t nBlockRewardStartCoin = 5 * COIN;
static const int64_t nBlockRewardMinimumCoin = .011 * COIN;
New version with wrong parameters:
static const int64_t nGenesisBlockRewardCoin = 1 * COIN;
static const int64_t nBlockRewardStartCoin = 2048 * COIN;
static const int64_t nBlockRewardMinimumCoin = 1 * COIN;