Hi,
There are a few cases where we see that KRPano falls back to CSS3D (WebGL is not avaiable for some reasons) and in IE11 and Chrome 56 this seems to work OK.
But in Chrome 54, the cube is not displaying correctly. We use KRPano 1.19pr8, so according to the news, pr7+ should work with CSS3D and Chrome 50+
See attached image on how it looks.