Natalie - thank you so much for your reply. The course loading issue is a bit different from the blank screen issue that we have also experienced in the past. The recommendation there regarding the reset and/or force new attempt is something we'll have to consider.
On Totara Learn v17, the information given next to require status in the scorm activity completion reads, "Checking one or more statuses will require a user to achieve at least one of the checked statuses in order to be marked complete in this SCORM activity, as well as any other Activity completion requirements." We did not always have both checked and only did so when we found that it was required to get a third party vendor's scorm courses to complete in our LMS. That said, on these courses with completion issues, I will try unchecking one and matching the selection we keep to the tracking settings in Storyline or Rise.
I really appreciate your feedback. Thank you for taking the time.