Small bug: as in the subject. I can see the movie (the first shot of it) with the blue/white circle+arrow on it. I click, black screen of the embedded clip, nothing happens.
Win 8.1 x64, 8GB RAM, internet speed OK, ca 600 MB.
Beside that, so far, almost fantastic. :)))
@Pref, it might be codecs issue, you might want to try xp build, this one has different set included or experimental QtWebEngine build (might be a bit crashy right now...), that one bundles own codecs too.