The troubled terminal, closed just Tuesday as dockworkers honored a picket line, shut in the early afternoon Wednesday after longshore union members called a work stoppage due to what they characterized as health and safety issues. The shutdown is yet another setback for the embattled terminal, where members of the International Longshore and Warehouse Union have been feuding with terminal operator ICTSI Oregon Inc. Each side blames the other for slow work, chronic delays and lines of trucks in a situation closely monitored by Hanjin Shipping Co., which may soon decide to stop calling on Portland altogether. Jan Holmes, the same arbitrator who responded Tuesday, was back at the North Portland terminal Wednesday, collecting information and preparing to rule on the new work stoppage.