I have bitshares from before the migration to 2.0 that were never claimed. I attempted to export the private keys from a wallet that is older than 0.9.3c and import them into 2.0 web wallet. I was able to successfully import the owner key but when attempting to claim the my 1.0 balance I get the message "No unclaimed balances found." Do I definitely have to  import a json wallet into 0.9.3c and export it from that client to successfully claim my 1.0 balance?