Can anyone tell me why I need to click twice in VLC just so that a little plus button would appear?

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http://unix.stackexchange.com – Basically what happens is this: I open VLC and go to my playlist and there are tons of folders there. I double-click on one and its icon changes to a folder icon and a plus sign appears next to it, but it stays closed. Then I need to double-click again to see what songs are in it. Is this normal? On Ubuntu 11.10 I didn't have this problem, but now on my Linux Mint 14 Mate...I do. (HowTos)