Im sure they are working on it and have tested it. Have you enabled Compatibility mode?
Try a different browser like FF by chance?
If this fails, you'll need to phone contact D-Link support and get help on it. IE 11 is fairly new so please be patient.
I realize we need to have some patience but after 6 months we still have no fix for the java security mess either. A submission to dlink support produced no response at all.
How can you be sure they are working on it, did someone in development tell you? IE 11 was announced months ago and would have been available via Technet subscription which I am confidant DLink has a subscription to.
Do you have any contact in development that can give a solid indication if progress on these topics?
Wonderful product and tool, software makes it very limited. It can't be that difficult to test and fix these glaring problems?