Sorry if this was already stated, I looked yet I didn't see anything.
This has happened to me more then 4 times in the last hour in the Coliseum.
Mostly only when fighting others in the Ranking up.
I know other had this problem too, because some people will stop attacking after they kill one of my dragons.
It mostly happens when you are about to attack or when you kill a dragon of the other team.
Image of how it looks sometimes: http://i57.tinypic.com/29y61rr.png
Edit: It happens on both Firefox and internet explorer
This has happened to me more then 4 times in the last hour in the Coliseum.
Mostly only when fighting others in the Ranking up.
I know other had this problem too, because some people will stop attacking after they kill one of my dragons.
It mostly happens when you are about to attack or when you kill a dragon of the other team.
Image of how it looks sometimes: http://i57.tinypic.com/29y61rr.png
Edit: It happens on both Firefox and internet explorer