Sorry to hear about the problems you've been having. What's your product's complete model code?
Why there is no 'Search' filed on Smart Hub, as it is described as option in manual - picture at topic 2? I wish to find 'Tune In' application that is not listed on available applications (but it exists as option to install). Is there option to login to smart hub through PC, search for specific smart hub application and select to be installed on Samsung TV (like Android apps through GooglePlay web service)?