How to copy wallet.dat from v0.10.2.0 to v0.11.0. I am trying to import the balance from the older version to the newer one. I deleted the wallet.dat from the newer one and copied the older one into its place. However, the wallet will not start with the old wallet.dat. I get a small "error" msg box. When I click "ok" qt closes down. 

Are the two wallets incompatible? If so, is there another way to import my balance to the new wallet?

Thanks
As there was no response for this, and in case someone else has the same problem, I dumped the private keys, and then imported them to the other client.