I would suggest you delete the blockchain from your wallet and resync from scratch.
Make sure you backup your wallet.dat and don't delete it
I am 99% sure this will show your coins
Have done that already, it did not solve the problem. But thanks for the help, it is appreciated.
have you tried to reinstall the wallet?
Going to do that tomorrow, think that might help, last thing I can try

Good luck
Tried to rescan, but that did not work for me either.
But after importing my private key into a brandnew wallet, I finally see the right amount of coins, and all the other errors are gone as well
