I'm trying out the 2.0 version and there is a close button for the playlist, media library, and equalizer windows. Just make sure you hover to right above the upper right corner of the window and the minimize/close buttons will pop up (a nice feature to keep the skin clean).
One intermittent problem I noted is that when using the new, default skin, sometimes when I open a video and then put it into full screen the taskbar will still be showing at the bottom for a second, then it will try to hide itself. It doesn't hide properly though and leaves scraggly black and white lines in it's place at the bottom of the screen (sorry for the poor description). This doesn't happen always though.
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