Q:

Other players aren't visible in the mc.hypixel.net Minecraft Server

I've been playing on the server mc.hypixel.net and I've never had any problem with it (except that it was really laggy sometimes).
After a while, all players disappeared, and the world was empty.
I could still chat with them, but they weren't visible anywhere.
I tried reinstalling Minecraft, but nothing changed. 
Help me please?

A:

You probably used the Lime Dye in the hub.
The server has a plugin that toggles player visibility if you right click while holding the Lime Dye.
Just right click while holding the Lime Dye again to restore player visibility.

