Online shopping during the holidays may not be as seamless as customers might want. A new study from software testing services firm uTest, which asked 600 testers from 20 countries to examine three popular shopping sites for technical, functional and security bugs, found that Target had the most reported holes (261), followed by Walmart (150) and then Amazon (94). Nine percent of the discovered flaws were classified as "showstoppers," meaning they were in need of immediate attention. — GM