Error "Unable to cast object of type 'Quest.Toad.Oracle.Proxy.OracleProxyConnection" after being prompted to change expired Oracle password. (4309036)

After being prompted to change an Oracle expired password, the following error occurs on clicking 'OK':

System.InvalidCastException:

Unable to cast object of type 'Quest.Toad.Oracle.Proxy.OracleProxyConnection' to type 'Devart.Data.Oracle.OracleConnection'.

Stack trace:

at Quest.Toad.Oracle.OracleToadConnection.OpenConnection(IDbConnection connection) at Quest.Toad.Db.Connection.AllocConnection() at Quest.Toad.Db.Connection.Connect(Boolean notify) at Quest.Toad.Db.Provider.BackgroundConnector.CreateBackgroundConnection()