Also, there is a message in the login window of TSR that stated 'No Oracle Client', as if it is not detected, even if Toad and SQL*Plus connect fine and can run the same SQL statement.
対策
Open Toad Script Runner, and go to the menu: Edit | TSR Options | Oracle - and tick 'Use Oracle Client' tickbox.
Then restart Toad and TSR, and follow the steps to run a statement in TSR, and the connection will use the Oracle Client on your machine