Issue only occurs with tables that have columns where the value is automatically generated using IDENTITY e.g.
CREATE TABLE new_employees
(
id_num int IDENTITY(1,1),
fname varchar (20),
minit char(1),
lname varchar(30)
)
WORKAROUND
Read all rows in table first and then add row at the end
STATUS
Waiting for fix in a future release of Toad for SQL Server