In Moodle (popular open source LMS with poor SCORM support), if a course is set up to have unlimited attempts (or perhaps just to allow more than 1 attempt). After you complete the course and try to resume it. If you don't select start new attempt, Moodle produces an error in the that results in it not providing the SCORM API. The Moodle error is invisible to the user, but you can see if if you dig down in Firebug into the script tag that references api.php. The end result of the error is that the content will probably throw an error saying it can't find the SCORM API.

This issue is fixed in Moodle version 1.9.2