App icon duplicated with a 'grayish' overlay on iPhone 6 with iOS 8 I've had this iPhone 6 for a week now. Today my WhatsApp duplicated itself with a 'grayish' overlay on it. I can move it around, but when tapping it nothing happens. How does this happen and how can I get rid of this? 

I guess it might have happened after an update, it's the second time this has happened. First time it happened a different app duplicated itself just like this. I've been searching the Internet, but could not find any explanation/solution.  Here's a screenshot of it:
This happens sometimes when an app installation or update fails and SpringBoard still shows the icon from cache.

To fix it, try any of the following:


Sometimes, holding down on any icon to start edit mode, then tapping the × to delete the placeholder will work fine.
Reboot—this clears SpringBoard cache.
If your device is jailbroken, run uicache as mobile, then respring.