I just checked back into this coin after years of not paying attention, I had coins in the old POW wallet I followed what I read for converting to the POS wallet, backed up the wallet.dat, moved it to the new POS wallet, let it sync up, fully synced now but no coins are showing. I too get the checkpoint is too old, is that why my coins haven't shown up? Made the shortcut to the wallet and added "-salvagewallet" to the end of the target.