I tried 'minting' two zVert with the new 0.8.7.2 wallet and it doesn't seem to work. Do you have instructions on how to properly use Zerocoin?

It lists 'sent to' in the transaction history, but it doesn't seem to make it to the blockchain. I tried closing the wallet and reopening it then it gave an error about the wallet.dat being corrupt due to some missing transactions or something. This issue was resolved by reindexing the blockchain, though the 2 zVert that I originally minted seem to have disappeared. It won't let me 'spend' them in the Zerocoin tab.