The Proxlet software provided has issues as the "main_content_wrapper.html" file in the Proxlet sometimes does not allow SCORM based content, placed in on-premise content servers, to open properly as it has compatibility issues. Please update the Proxlet to fix the compatibility issues.
The solution to this problem is to update the main_content_wrapper.html file and add below line to it to fix the issues
<meta http-equiv="X-UA-Compatible" content="IE=edge">