On all servers and versions I have tried, I am having an issue where the majority of players skins do not show excluding my own and sometimes others. I do not believe this is a problem with my computer as I had just completely reinstalled windows just yesterday and have reinstalled Minecraft twice after deleting the .minecraft folder, and reinstalling the game(I have tested this without forge or optifine and get the same result). I don't know what is causing this however I been able to view skins through an altered Minecraft client that does not require Minecraft installed though it is not safe to use on servers.

EVIDENCE:

https://www.youtube.com/watch?v=xH9kl53YadY