As of today all the apps I have moved to the SD card no longer work. The message "app not installed" appears. Also, when I try to move a new app to the SD card, taking the move to SD card option, I get told it cannot be moved to the SD card.

All the music and photos on the card still work fine.

Has anything changed to disable running apps from SD on the Tab3? The Android version is 4.2.2 and has worked fine for a month.

I have tried unmounting and mounting to no avail. Any advice?