Although we use the Learn.com LMS, I just tried a course in Mozilla FF and it ran with no problem. I use Lectora 2006 and publish to SCORM 1.2. Although I'm not a SCORM expert, it sounds like you might be getting fed a line from Plateau. It seems bizarre to me that Lectora would cause the browser to behave differently. It seems much more likely that the LMS isn't set up properly for Firefox. Anyone with an expert opinion care to share?Russ