A software bug affecting Starbucks cash registers forced over 8100 stores to close for a day this spring, roughly 60% of the Starbucks locations worldwide. The software malfunction allegedly originated during a daily “system refresh” that affects all company owned Starbucks stores in North America. The resulting bug left thousands of stores unable to process orders, accept payment, or proceed with business. Starbucks declined to provide any further details regarding the register malfunctions and the glitch that shut them down.