I had an SMS thread that had my friends phone number instead of his name on it so I deleted the thread and let the next message recreate it. When the threa was recreated there were all these blank entries in the thread. I had to scroll up to the top of the thread to see the last message. Then, if you are in the thread when a message comes in it will not appear in the list unless you back out to the main SMS app screen and then click back into it. I am guessing that there were blank entries, or the app remembered there being more entries then there were, but eventually the texts I recieved filled up the blank ones. Once they were all filled in it worked right. It was very strange.