Entities not showing up?

I am making a resource pack, and use Nova Skins to help make textures for all my mobs. However, it seems that no entities are showing up! They showed up once, but now they’re gone. When I go to the “entities” page, all I get is an empty page, apart from the sidebars and background. No matter how many times I refresh the page, its still blank. Anyone know what causes this? Also, will we once again get Mo’ Creatures models to texture? There used to be some, but now I can’t find them.

I have the same issue. I made sure that my browser supported WEBGL, and it still didn’t work. I also tried multiple browsers, such as Chrome, IE, and Firefox

The same things happened to me. I have no idea how to fix it. sorry.