Well, I seen my first tutorial video. It's all right, but have one issue: when it's ends, it does nothing. I can watch indefinitely on this black window until I'll press "close". Why? It seems, I cannot repeat it or select something in this window - so why to keep it on screen? I am suggesting to auto-close it after playback, or, maybe, have this youtube-like button "Play it again".

Oh,  I just discover that pressing strange square button in the corner will move you to Hiergamenon. I think, you need tooltip for it. But what is stranger is that you can press the same button inside Hiergamenon, out of video, and move to the same empty screen again!

Hmm, am I right that any video I can watch only once? 

--edit--

Oops, next tutorial "fixed" previous question and "resetted" first video. Ok, this question is closed. But then another arises: can I have controls for disable/pause/rewind this videos?