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.
How to use Zerocoin
1. Create MINT Zerocoin with Mint Zerocoin button

2. You will see MINT Tx in Transaction tab

3. Waiting until at least 8 confirmations for the MINT Tx

4. Go to Zerocoin tab, then click Spend Zerocoin button

5. You will see result that the MINT Zerocoin changes from New to Used

6. Wait for a confirmation for the SPEND Tx

7. Selected "Settings" > "Options"

8. Selected "Display" tab > Enable "Display Coin Control features (expertes only!)"

9. Click "Send" tab, selected "Inputs..."
10. Selected Coin that you got from SPEND Tx, then click "OK"

11. You will see Send tab, like the below picture, now you can send coin without trace.

Then I think the spend button should be greyed out until there is actually some minted ZVTC to spend. Whenever the criteria is met (have minted coin with 8 confirmations), it should be available to press again.