Friends cant see my messages in chat in minecraft realms.

In my minecraft realms server my friends cant see my chat or signs, not even what i write in books, this is very weird because yesterday we were playing without any problems, but today the problem began a few hours ago and we really dont know why, i´ve tried everything, turn on/off the chat realm´s filter, reset my computer, my friends also reset their's computer, even reset all the menu options but nothing has work, i am incommunicated in my own minecraft server!