Hi,
I was testing our CMS-systems in Win 8 IE 10, and saw that your editor (ASP) just was a simple text-box.
In addition to this i tested the ASP.NET, PHP and ASP versions on your demo-page, and all but the Classic ASP version seemed to work.
A small comfort is that the ASP version seems to work in compability mode.
I think you probobly already are working on this but to be on the safe side i thougt best to report it here.