hi, I'm not sure this is bug or not. I have iPhone and iPad, and I mainly use iPhone but recently I have purchased rubies through the iPad a few times. Then I can not see available purchases in the game on my iPhone anymore. But at the same time I see it available on my iPad. The thing is I want to purchase items whatever I use. If it can not, wanna change main device. Also one recommendation, it would be better I see numbers of survive my units during the battle. Thank you, it's great game and I am so enjoying to play this.
If you are having a problem with the Market saying gems are 'sold out' this is a known issue we are investigating. In the mean time, if you delete the game and re-install, it should fix the problem. Apologies for the inconvenience.
