A friend and I have been experiencing the same we both have Android/AT&T. Only difference is that I was sending Chinese where she was receiving Chinese. Here's what I did tonight that seem to fix my issue. I assume the issue started with the new version update but not sure. I sent to Settings...Language and Input....I clicked on Samsung keyboard because underneath it stated Multiple Languages. I scrolled through to make sure only ENGLISH(US) was selected and it was...but once I exited I no longer sent Chinese texts to my friends. I know it sounds odd, but that's the only thing I did. Good Luck!!