Apps won't install

[FreddieF]

Since yesterday my S5 would not install any app I downloaded. I tried to install a new app from the Play Store: it would download, but then nothing happens...
I tried updating a app via Play Store: same thing.
I downloaded the Amazon App Shop-App, the APK is saved on my device, but when I tap on it to install it, nothing happens...

What kind of sorcery is this?

 

[B. Diddy]

Make sure the Download Manager isn't disabled somehow. Go to the App Manager, select Download Manager, and select Enable if it's disabled.

Since it isn't installing the Amazon Appstore apk, I assume this isn't an isolated Google Play Store issue. You might want to try booting into Recovery and wiping the system cache partition: Reset: Samsung Galaxy S 5 | T-Mobile Support

 

[FreddieF]

Thank you so much!!!

The wipe helped.

 

[B. Diddy]

No, wiping the cache partition won't erase any personal data.

 

[FreddieF]

Wiping the Cache solved the problem!