IPhone, every time I open app it goes black?

I recently got the 6 plus about 2-3 weeks ago. Every time I open an app the app pops up then the screen goes black. After the screen goes black it stays that way and then I click the home button and it goes away then I click on the same app and it's fine. I've restarted my phone and it still does it. It doesn't just do it on apps that I've downloaded. It does it on my messages, and my clock, etc, apps that have been programmed into my phone.

Let me guess, you did the iOS 9 update! IOS 9 "broke" a lot of apps. I have a few that still don't work. I got a couple of updates today that say they have iOS 9 compatibility.

Check the app store for updated versions of the apps that are giving you issues.

Its probably just an issue with that 1 app?

Factory Reset your device, it will change all your settings to default and also if you are using an iPhone, you need a good app to secure your personal data. You could try Leo Privacy Guard in that case and make your device utmost secure.