Hi Rebecca

There was a problem with SCORMs fixed in 12.33 where the progress of an attempt was reaching a limit (64kb characters) 

To see if this might apply - as an admin, check the saved attempt data (in the scorm module, reports -> basic -> click the "1" next to the learner's name -> track details) and there will be a lot of characters in cmi,interactions

The other thing that may have happened is you have updated the course and the user who has an attempt saved tries to relaunch the course after saving progress and the updated course doesn't match the same structure as the original one.

I also found this post in the Articulate forums  For us it turned out that the problem was caused after Articulate made a change to the Scorm driver file in the last Rise update (which I think was around November 2020). Our LMS couldn't handle the change (where a course was published as 1.2 but was being detected as 2004) and therefore anything that was packaged with the new driver would return a blank screen on second launch. The fix was to simply find an old Rise course (pre-Nov update) copy out the scorm driver and use this in any new packaged content.

If these don't help then please file a support ticket as George suggested.  

Regards