I too have confirmed that Mondo Solitaire for the iPhone 6/6S models does not work. I have used, and enjoyed, this game for years and am sad that it is now broken. I have e-mailed the developer, but have had no response. Given the fact that this problem was discovered in 2014 I dont think its likely they will ever repair the software. Truly a sad end to a wonderful game. I do fault the developer for not withdrawing the game since it is now obvious they have no intention of fixing it.
EtheP about Mondo Solitaire, v1.0.7