I've just updated my S4 (GTi9505) to version 4.3, and now all the apps which are on my SD card are grey squares rather than their own icons! How can I sort this out and keep them on the SD card? I've tried moving them to the phone storage and the pics come back, but as soon as i move them back to sd card they're gone again! It wasn't like this before, any ideas how I can fix it? Thanks