Tastykake announced Wednesday that production trouble and smaller than expected savings from the company's new plant in South Philadelphia spell financial difficulty for the maker of Butterscotch Krimpets and other treats. Bruce Rader, a professor at Temple's Fox School of Business, said it's a textbook cash-flow problem. "Most people don't realize that cash flow is what determines if you are going to survive or not," he said. "They've added and equipped the new plant and they expected a lot of savings from the new plant — and that is just not materializing."