1. A hero opens a chest, and OL reads the chest contains 2 CT, 1 Healing Potion and 1 Silver Treasure. Each hero in play will get 1 Silver Treasure, but will each hero get 1 Healing Potion, or just the one who opened the chest(we`ve always used the last option, for about 2 years now).

usualy all treasure in a chest are moltiplicated for each heros, so probably even the potion i assume.

but considering the less number of potion in the base game, including the potion the heros can found on the ground i use to give one potion only to the hero who open the chest.

when we run out of potion token, simply i dont give potion anymore, whit this metod i've always a potion to give to my players

I don't actually recall any chests containing potions, but yes, every hero should get one.