User running Toad 8.6.1 or older and has connections saved in the connection window. User then upgrades to Toad 9.0.1 or newer which has an additional column "Oracle Home" in the connection grid. Upgraded connections have a blank Oracle Home value.
Delete the connection from the grid and then recreate it by connecting to it. The Oracle Home will populate with which ever home was used to make the connection.
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