I don't think the new wallet, 1.8  is working correctly.  It immediately starts PoS'ing everything and the block numbers are not even consecutive.  If you "checkmininginfo" the block numbers get higher then lower and invalidate previous PoS coins.  It also won't stay in sync with the pool and the block explorer.

I still use 1.7.0.1 and it is working fine.  I stopped using 1.7.0.2 after having problems with it also.