Hello! A reboot of your device might help. You also can boot into safe mode and clear your cache partition. This could help clear up whatever is snagging your apps. To log into safe mode do the following: If the device is on, turn it off. Press and hold the “Volume Down” button, Then press the “Power” button until the Galaxy Tab 4 powers on. Continue to hold down only the “Volume Down” button until the Home screen loads. You should see the words “Safe Mode” appear in the lower left corner of the screen. Scroll down using the volume keys and select clear cache partition. Hopefully this helps!!