I built a non-responsive course in Captivate 2019 that includes several advanced actions and three short MP4 videos. I published it to HTML5 and uploaded the SCORM package to my SumTotal LMS. It plays perfectly in Chrome, but in IE, 75% of learners are experiencing issues: many pages take a long time to load, some images and shapes don't display, and even after viewing the whole project and achieving a passing score on the quiz, the course doesn't mark complete. SumTotal was able to replicate the issues and concluded that "the course was not built for IE 11". They suggested I "rebuild the course for IE 11". I'm lost. Does anyone have insight for me?
The real problem is IE, which is not even very much supported by MS (favors Edge). IE is pretty bad in supporting HTML5. However I am not able to point you to resources explaining what is exactly unsupported in IE. Hope someone else can be of more help. To doubel-check if SumTotal is not also bit guilty, upload the course to SCORM Cloud and test with IE.
I also support Lieve's suggestion that you upload your SCORM to SCORM Cloud and have a few of the users that were unable to get it to work in their IE browser test it from there. I think you may be surprised to find that as long as your users are on the latest version of IE11 and not some earlier version, then it will probably work fine.
Captivate's HTML5 content should work just fine on IE11. My suspicion is that the real issue (as it almost always is ) will turn out to be your LMS, not the browser.
Lately I've been working on a project converting lots of modules from some extremely complex courses I created for a client several years ago. The animations were originally done in Flash and are now being converted to HTML5 OAMs, imported into Cp 2019. It was a requirement by the client that the updated HTML5 content had to work in IE11 because that was "the corporate standard browser" (even though all users also have Google Chrome and MS Edge on their system).
If these extremely complex modules can work in IE11, I'd be seriously doubting yours wouldn't also work as well.
The number one rule in SCORM courses is: "Never believe what the LMS people tell you if they're blaming your content."