This problem with stuck “loading data” - I had it on several versions of GlassWire - appears to have disappeared since I upgraded my main computer to Windows 10 1607. So I took notice when you said that you are still running 1511. As far as I can tell all my major problems such as data not logging have disappeared since I upgraded to Windows 10 1607 on both my computers running GlassWire.
Does anyone else have information for or against the idea that these problems are mainly or only on Windows 10 version 1511?
@Kittens, does this idea appear to have any relevance to your problem: