You can fix the video issue by wrapping it in a div tag like this:
<div style="max-width: 150px">[embed width="200" height="100"]https://www.youtube.com/watch?v=aSSXv_s6Sd4[/embed]</div>
You need to do that in the HTML editor, not the visual editor.
The playlist bug is a known issue that’s going to be fixed in a future version but I can’t give you an exact timeframe as it is pretty complex.