This happened numerous times during the Daily 4 on 10/12/16. I have no idea who I'm playing against. There were no cards or animations from any player. I had other tables open but none of them had this issue. It was intermittant.
On the final table of the same MTT we were down to 8 but I could only see 7 players. (I don't know why I didn't screengrab it). This player didn't exist for the entire time I I was on the final table.