I know this has been discussed throughly but I am so frustrated and until S8 fixes this I will NOT buy gems or any special offers.
Today I was looking at my sawmill to find upgrade material requirements. When I left that screen the game immediately sped up the collection time...bye bye gems.
It is ridiculous. This happens so often. I refuse to buy anything until some sort of confirmation step is added.
I've even had it happen during the games' resets...you know, you're collecting things, the game appears non responsive so you tap again suddenly you've collected the first time, gems have gone missing and the item is ready for collection.