Paul Hendricks, 10, received some guidance from his mother Anne, as he worked his first day of fifth grade from his bedroom in St. Paul, Minn. —Elizabeth Flores/Star Tribune via AP Houston Students across the U.S. ran into computer glitches Tuesday as they began the school year with online instruction at home because of the coronavirus, adding to the list of problems that have thrust many a harried parent into the role of teacher’s aide and tech support person. Blackboard, which hit four times its year-to-date user average by 8 a.m., wasn’t the only tech company running into issues Tuesday. Websites that track internet outages like downdetector.com also recorded spikes…