Game sometimes freezes when playing on a server for an extended period of time, quitting, and joining a different one.

Minecraft will freeze when I click any GUI buttons anywhere (after disconnecting from a server) in the Main, SinglePlayer World Select, or MultiPlayer Server Select menus.

What I expected to happen was...:
Doing what the button normally does. (ie Selecting world or Server)

What actually happened was...:
The game froze, and didn't provide an error report

Steps to Reproduce:
1. Log In
2. Connect to a server (Stay on for a while)
3. Disconnect
4. You may notice that all servers in the list will be polling forever. If you try to click on any button, the bug happens.

Additional Information:
In Windows Task Manager, in the "Processes" tab, after the bug happens you can use "End Process" and it will quit minecraft, but the Java Process doesn't end. If you re-open minecraft, it will make a NEW java process, and this continually happens. After a while (without restarting your computer)you will have TONS of Java processes running.

This bug is especially happening when you click on a server that is still loading. (ie while the blue thingy that normally tells how good of a connection you have is moving from left to right)

"Bugpt1.PNG" depicts before the bug happens while using minecraft
"Bugpt2.PNG" is AFTER the bug happened twice, and with minecraft open. (2 are un-endable w/o logging off, while 1 of them can be ended by closing minecraft)