Hello there,
I am not sure of when the issue started, but I know that I used to be able to select multiple .mp3 files at once, press enter and VLC would put them in a playlist ready to be played.
Now the issue come in where, if I do that, now for some reason, each items will be added one-at-a-time to the playlist. If I had selected 300+ items, the process of adding the item, refreshing the list, play the item over and over again may take several time as opposed to a one time seconds process.