I have created a course with multiple AUs and published in SCORM 1.2. When viewing the course on the LMS I select the first AU from the LMS menu and look at the content. When I select another AU from the LMS menu the course closes. I am using Lectora Inspire 17.1.1.
I'm not 100% clear on what you want to do, or what's happening. Are you selecting multiple AUs from within the Lectora course window, or are they separate units (SCOs) within the LMS itself?