Returning Samsung BD-D5700
I'm sorry to hear that you were having trouble installing the App. I'm not aware of a large scale problem, which points to either something to do with local regions (are any of these outside the US?), connectivity problems, the TV or SmartHub not being updated (sometimes the initial process has several App updates that must be done in a row), or other possible variables.
I hope we can earn your business in the future, and I'm sorry we weren't able to assist this time.