Bloodpack Shamon is really unstable.
About half the games I'm using tht ally crash.
Im using the Desktop Client.
It crashes when you click on an ally on your GY and it becomes big before you can click on select.
I dunno what causes this exactly. But the ammount of time the game crashes when I use that ally in relation to the time the game crashes if I don't use it is suspisious.
Hope that helps.