Employees at San Antonio-based Frost & Sullivan say haven’t received their last two paychecks from the global research firm as it struggles with cash flow problems, the Express-News reports. The global research firm, which purports to help clients weather the vagaries of the international business environment, cites cash flow challenges as the reason it’s behind on paychecks, workers speaking on condition of anonymity told the daily. Reportedly, the first missed payment should have been received June 30.