Well the only thing I discovered when using IE11 (possibly same in Chrome) is that there is no page scroller, so on first look the page looks dead and you only see the top of the course page. I have a scroller om my mouse so it works OK but if you are used to dragging the side scroller up and down you may be foxed into thinking that the page is not loading.
That's my theory...unless it is something to do with the way the Pioneer theme is made? It's hard to say really.
M