Would this help, run it from the command line interface (cli).
1) check the keys of your current DVS account.
>>> wallet_account_list_public_keys <account_name>
2) use the 'wallet_import_keys_from_json' command. Make sure you've got correct passphrase.
Previously, it would fail silently if the password is incorrect.
>>> wallet_import_keys_from_json <json_filename> <imported_wallet_passphrase> <account>
3) check the keys of your current DVS account again to see if any keys were added.
>>> wallet_account_list_public_keys <account_name>
You can see the help information for the command with:
>>> help wallet_account_list_public_keys
I couldn't import my keys in 0.6.1 version. The 0.6.2 was supposed to add 'robustness' to the 'wallet_import_keys_from_json' command.
I couldn't wait for 0.6.2, so i downgraded to 0.5.0 just to import the keys, went back to 0.6.1 and replayed the blockchain.