I'm wondering if there is a bug in the client in how it reports balance. I'm convinced my balance is too high, other users seem to suggest it is too low. I am going to attempt to transfer my MNT to another address tonight to confirm whether it's a true balance.
Did you switch to 1.6->1.7 in time, or late?
If you switched late, you may have to delete your blockchain and redownload it (
don't forget to backup your wallet.dat ). You can try running 1.8 first, if it opens without any errors, you don't have to redownload blockchain. 1.8 is better anyway with the coin controls and new checkpoints.
If you're suspicious something is wrong in your balance, open debug window, and type "checkwallet". If it reports problems with your balance, you can run "repairwallet" (
just in case, backup your wallet.dat first ). Your wallet may believe some of your orphan PoS blocks might not have orphaned, these commands will check and sync those.