My phone hasn't been letting me watch any ads lately

[ZomBrony]

Like my profile says, I own a ZTE Grand X2 phone. (Model Z850 if that matters) It's running Android 5.1.

Now I know my title sounds a bit strange, but it really is a strange issue. The reason I've been trying to watch ads is for PewDiePie's Tuber Simulator; boosting my views and such, obviously. But another game I play sometimes is called PickCrafter; a Minecraft-themed idle game. It also rewards you for watching ads by giving you a ton of picks.

By not letting me watch, I'm referring to the problem that the apps instantly exit and restart. It's like they're crashing, but I have no idea why if that's the case. And obviously, if the apps are closing, I'm not getting my rewards. So what is this? Why is it happening? How do I fix it?

 

[B. Diddy]

Does the phone have any kind of security apps installed, either by you or preloaded by ZTE? One of those might be preventing the ads from running.

 

[ZomBrony]

Does the phone have any kind of security apps installed, either by you or preloaded by ZTE? One of those might be preventing the ads from running.

The only app I can think of like that would be Avast. But I've always had Avast.. It only became a problem recently.

 

[B. Diddy]

Maybe a recent update to Avast included some new features. Try uninstalling Avast temporarily to see if it makes a difference.