Hi, I'm posting this because I didn't hear of any problem about. However I updated my client to Lore and after blockchain resynch showed an incorrect balance. I tried to start the client with -rescan option but didn't had any effect. It seems that one wallet address shows nearly 300 blk less after doing listaddressgroupings. Anyone experiencing this trouble? So I got back to the old wallet app and balance is now correct again.
This can be solved using dumpwallet command from console it produces a file with all private and public keys.
This file can be imported using importwallet, after that the balance is the same as in old wallet.
Next release will have incompatible wallet, and use different directory as the reference client.
There will also be an migration script which will automatically transfer funds to new wallet.
If you want to contact the devs directly you can ask on slack under #support.