The first issue is that when you "minimize" the player, it can not be restored. This issue has also been mentioned in the thread "floating window problem with Mavericks", however, it may have been missed or misunderstood due to the OP talking about full-screen mode ... this problem occurs regardless of whether the program is in full screen or 1xvideo size or 2xvideo size etc.
The second issue is that if you have iTunes playing music via OSX set to "USB DAC" with VLC set to "Built in output", every time you open a new VLC video, it will stop the iTunes playing via USB ... you can then manually restart iTunes playing via USB whilst watching a movie on VLC outputting to "Built in Output", however this behaviour is annoying, and has not occurred in previous versions - why should VLC stop iTunes, when they are not outputting to the same sound device each time a new video is started ?