I see this issue when I update the content and replace the scorm files on the LMS. Anyone who has previously launched the content (pre-updated content) is presented with a blank screen when the re-launch the course. Have you made updates to the content in this way?
Also, I know Articulate point people to SCORM cloud for testing content but it is not really a particularly helpful tool as absolutely any scorm content will work on it as it should- regardless of how well put together the SCORM content is. No other LMS offers anything like the flexibility/forgiveness of scorm cloud.