We have discovered that Totara 2.5.13, which included changes made in Moodle 2.5.6, contains a bug in mod/scorm which may make it impossible for learners to complete a SCORM package.

If a SCORM is attempted and failed on the first attempt, subsequent attempts are not registered properly even if successful. Because of the bug the "Force new attempt" setting has no effect and the learner is effectively stuck and can never complete the SCORM activity

This only affects SCORM packages which can return a status of failed, where the completion criteria are set to require a status of passed or completed. Any SCORMS of this type should be checked to ensure the "Force new attempt" setting is set to Yes after the upgrade - learners who failed their first attempt should then be able to retake the SCORM and have successful completions registered properly.

You will only need to upgrade to this emergency release if you are already running 2.5.13, no earlier version or branch is affected by this particular bug.

2.5.13.1 also contains some other fixes that had finished testing and were ready for release. Here's the changelog:

Release 2.5.13.1 (29th May 2014):
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Security Fixes:
    T-12441    Fixed potential XSS vulnerability in quicklinks block

Improvements:
    T-12433    Show names of participants in Appraisal overview and snapshots

Bug Fixes:
    T-12463    Fix critical SCORM error where subsequent attempts after an initial failed attempt are not recorded
    T-12326    Extend execution time limit on recovering lost course completion criteria data from activity completion records
    T-12202    Fix issue where some dialog boxes can become non-modal in Appraisals
    T-12444    Fix for the course completion import report sometimes returning zero records
    T-12121    Fix transaction error when quiz completion triggers sending of messages
    T-12277    Fix Face-to-face reminders still being sent to users who have cancelled from a session