Could you give us a little more info regarding this please? Firstly, what's the model code and software version of your TV? Go to Home > Settings > Support > About This TV.
Same here. After a while, like next day, the thumbnail icons reappeared eventually, but until then I had to rely on app name alone, which made it very difficult to navigate the app store, specially when you look at the "related apps" strip at the bottom of an app page.
