Can not install applications from an unknown source

All of a sudden I can't install applications not since Google play. I have the setting checked to allow, but when the app install window opens the possibility of installing does nothing. I can watch all the authorizations and cancel but not install.
I've tried several apps and all have the same result.
I tried starting a download and my Monster app support.

Any ideas?

Do you by chance have JD, filter sieve, or setting screen installed. I found people on other forums saying that when these are installed that it prevents the installation application. I hope this helps.

Tags: Motorola Phones

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