So I updated my wallet from v0.8.6.2.4-g000002-beta to v0.8.6.3-beta. The new wallet syncs without problem but it shows 0 coins. Why?
When opening the old wallet all my coins are still there.
The folder where the wallet.dat file changed name.
It as "Karmacoin" (C:\Users\YourUserName\Appdata\Roaming\Karmacoin).
Now it is "Karma" (C:\Users\YourUserName\Appdata\Roaming\Karma).
Backup your wallet with your old wallet (tho one that shows the coins).
Place the file with the old wallet (name should be "wallet.dat") inside the "Karma" folder, and start the new wallet.
After synchronization with the network all your coins will be in your new wallet.
Good luck!