I open the Minecraft Launcher and click PLAY. Once it loads I click MULTIPLAYER and enter a server. It loads and it crashes.
What I expected to happen was...:
Minecraft would run normally.
What actually happened was...:
Minecraft crashed
Steps to Reproduce:
1. Open launcher and click play
2. Join a multiplayer server
3. Crash
There's a bug in Minecraft 1.10.1 that crashes your game when connecting to servers.
See MC-103981 and MC-103978 for more info.
In the meantime, you can safely downgrade to 1.10 until a proper fix is released.
To change your game to a different version, start the launcher. Select Edit Profile.
In the "Use Version" dropdown menu, select the game version you want. Then click Save Profile.