I've been using wordpress since long time a go. I never had such a problem.
Today I updated YARP plugin, everything ok until here (I don't think is related). The surprise is since today, when I want to add a new post if I add any special character in the title or in the body appears this kind of characters: ????.
The most weird even, is that if I do it from quick press works perefectly :O
Also the old posts still looking properly. (thanks good)
Please help me in this one, I already check the source code but both of the form they do the same. But one works and the other no.