Problem with Pottermore?

[Latisha]

Well, whenever I try and make a potion after it does absolutely NOTHING! I make the potion and no matter how perfect it is nothing happens. I wave my wand, then everything is just stuck. The timer carries on. I can't touch the potion book to see if everything is crossed but it won't let me, I can't touch the ingredients and I can't touch the cauldron. Please, PLEASE has anyone else had this problem, if so can you tell me how I can make it work so I can gain house points for Hufflepuff. I haven't gained any since I joined and I feel useless to my house.