Thumbnail images and screen shots have disappeared after installing booster I've had this phone (ALCATEL 918) for a few weeks. I felt it was moving exceptionally slow. So, I downloaded booster. 

Then, I noticed that all of the thumbnail images and screen shots have disappeared. Other then that, everything else works fine. How do I fix this?
This booster probably deleted all the cache files from your phone and as a result you don't see the thumbnails of your previous photos.

Go to 

sdcard/DCIM/


and delete the .thumbnails folder &amp; restart your phone. That should bring back your thumbnails.