Image endpoints not showing up?

Here it says that you just put that link and character id in the image label/button http://devforum.roblox.com/t/new-image-endpoints-that-can-be-used-in-game/28182 it works with webgl3d's character but not mine. i tried a few other and its 50/50 only 50% of people show up

It seems the images don't exist on the CDN until first requested. After the first request, the CDN will get the image but it takes a few minutes.

I just tried using your userId and it works fine.

Also by CDN, I'm referring to the URL that the web API redirects to. For example, the headshot-thumbnail URL for me,

https://www.roblox.com/headshot-thumbnail/image?userId=119683604&width=420&height=420&format=png

Redirects to rbxcdn.com...

https://t6.rbxcdn.com/efe1fba329fb4ea680df0ae6b4a8a0e2

The CDN URL I pasted above is not guaranteed to always work