I have a scorm with 3 levels in the toc. My first sco to launch is inside the third level.

When you launch the scorm the sco display without showing any issue but the debug tool shows that it is not well initialized :

SCORM API Activity Log
Mon, 02 Feb 2015 09:55:21 GMT: Moodle SCORM 1.2 API Loaded, Activity: Actvités 1 à 4, SCO: C-412550-1
Mon, 02 Feb 2015 09:55:30 GMT: LMSInitialize("", "") => 0 scoid = undefined
Mon, 02 Feb 2015 09:56:00 GMT: Commit("", "") => 0 scoid = undefined
Mon, 02 Feb 2015 09:56:00 GMT: LMSCommit("AJAXResult", "") => 0 scoid = undefined
Mon, 02 Feb 2015 09:56:00 GMT: LMSCommit("result", "false") => 0 scoid = undefined
Mon, 02 Feb 2015 09:56:00 GMT: LMSCommit("errorCode", "101") => 0 scoid = undefined
Mon, 02 Feb 2015 09:56:02 GMT: LMSInitialize("", "") => 101 scoid = 33427

Afterwards when I select another item of the toc I get a LMSInitialized 101 error code.