Fixed it for you; Made the same mistake myself, you have to put the Youtube-ID between the tags. Otherwise it will stack URL tags and YouTube tags on top of each other and make an empty video shell.
Here's mine: [YT]eY1BKHYyH_M[/YT]
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[YT]-jKTakowgho[/YT]
[YT]avdm8BTtfyU[/YT]
[YT]i7P6ut6HPR8[/YT]
Sia - Fair Game
[YT]m86nMHfvl7s[/YT]
Sublime - 40 oz to freedom
[YT]CI6eQiFGxO4[/YT]
[YT]O1fHxPY3TJo[/YT]
Ever heard a song so epic you started crying ?
Most people's arm hair stands up, I start crying...
[YT]5lLclBfKj48[/YT]
[YT]jaCCYL7TXLY[/YT]
[YT]iNAMI8DQc8M[/YT]
[YT]xVPvzX-AeSM[/YT]
[YT]VtNyLSGpU0w[/YT]