I like VLC's new Skin, but IMO the "Switch to Minimal Mode" button in the upper right corner is a little bit suboptimal. The problem is, that I'm used to have the "Maximize" (Fullscreen) button at this position. So it often happens to me, that I accidently switch to Minimal Mode, although I wanted fullscreen. The problem with that is, that when I switch back to Normal Mode, the video-output remains in the "external" Window and doesn't go back to the skinned interface. So each time I have to stop video, restart and seek to the correct pos.
My suggestions is to switch the position of the "Minimal Mode" button and the "Fullscreen" button.