Drag and Drop and IE8

I have a course that works great for me using chrome.  I had a collegue try to take it using IE8, and couldn't get a slide to work.  It was a drag and drop interaction with a delay in the dragable items showing (there was intro audio first I wanted to play before they could try the interaction).  Is there something with IE8 that would prevent the interaction from working?  This course will be deployed over a large userbase, so the simply upgrade the browser option won't work.  Thanks!

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