OK. Based on this new evidence my guess would be that your LMS server is not set up to serve MP4 video files. Captivate 5.5 used FLV video for Full Motion Recordings. Cp6 and Cp7 now record simulations as CPVC files which are then published to MP4 video before insertion into Captivate projects.
By default web servers are only initially set up to serve certain types of files. My guess would be that your LMS web server permits FLV video files but has not been set to also serve MP4. SCORM Cloud IS set up to serve MP4 and that's why your content works on SCORM Cloud but not on your current LMS.