Chat,sign,anvil issues

This issue is about the chat,sign,anvil glitch. 

Firstly, about the chat, I can text in the general chat, but none can see it, by the way I can't see the others. Next to the anvil bug, we can't rename the stuff. About the sign, the sign can not be typed, it will appear as a blank sign.

This happened to me the last week and to my friends as well.