Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.2.1 Chrome/38.0.2125.122 Safari/537.36 WebAppManager
This is the User Agent of the WebApp that is unable to load any streams.
Mozilla/5.0 (Linux; NetCast; U) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.31 SmartTV/7.0
This is the User Agent of the browser on the TV that will load streams fine.
From what I can tell they are both Chrome browsers driven by the WebKit engine.