Snapchat is not without glitches. On January 10th, 2017 users are able to receive Snapchat pictures, videos and texts but when they try to reply they get the error message “cannot receive your chat“. Note that this is the message that is received if you have been blocked by another user. That said, most people are seeing this message on Tuesday, January 10th, 2017 not because they have been blocked but because Snapchat is down or glitching.
Have you noticed that you cannot sent replies? When did this start for you?