I currently play on my Samsung Galaxy Tablet
At the first move of random battles, I am not receiving an extra turn after matching four or five gems. It only happens at the first gem match of a battle and not every battle.
This problem began with the upgrade and has happened to me on 9 or 10 battles throughout the past week. It does not seem to matter what color the gems or if it is 4 skulls. It has happened in PVP, Raid Boss and Explore battles.