Chat/Command Not working for 1.8 update

I just recently updated Minecraft to 1.8 version.

After going into my creative world I noticed that I was unable to use chat or commands. When Pressing (t) nothing happens when using nothing happens.
I have since tried to use this in any of my worlds: survival, multiplayer, and creative. I have attempted restarting my computer. All to no avail. I really dont want to have to delete my whole minecraft server and re download but that is my last option.