I had to restart my device. After restart a lot of my apps showed the blank sd card and android greyed out icon. When trying to select a greyed out app, a message " application not installed" is displayed. I have not touched the sd card. I have cheched the mounting of the sd card. I can read data on the sd card. The failed applications are all ones I have run off the sd card for six months. I have kept the operating system up to date. Am I missing something in the settings? Or do I have another issue? Many of the app were expensive, and I would like to get them back. Any advice will be appreciated.