HI. I was wondering if anyone has encountered this problem and knows if there is a way to fix it. We are using the AGOL map viewer's share->embed generated html code in external (to AGOL) web sites and the popup buttons do not appear. Well, they are there and work, but there are no button images. This problem seems to only occur in all versions of IE. Chrome and Firefox, at least, are fine.

Does anyone know if this is a known bug and/or is there something we can do to fix it?
If it helps, here's what we're using.
https://ncdot.maps.arcgis.com/apps/Embed/index.html?webmap=352556db969240c99a06a179f56b8403
Thanks!