Summer 2019 Blackboard Learn courses were initially populated with students on Friday, May 3, 2019 around 3:20 A.M. CDT. Any enrollment changes (add/drops) in the SIS should be processed within Blackboard Learn at the regular DIFFS intervals (7:30 a.m., 9:30 a.m, 11:30 a.m, 1:30 p.m., 3:30 p.m., 5:30 p.m.) or at the 3 a.m. FULL (Complete Refresh).