For 40,000 federal employees, this has not been a happy Friday. The reason: They didn’t get paid. Because of problems at the Interior Business Center (IBC), which handles payroll processing for numerous agencies outside of the Interior Department, paychecks that were supposed to be direct-deposited today didn’t go through, spokesman Michael Fernandez said in a statement later posted on the center’s website. Paychecks will now be deposited Tuesday, he said. The affected employees work in 23 of the 42 agencies served by the business center. They represent about 17 percent of the 240,000 workers paid through the IBC, according to the statement.…