Sony Vegas; Pressed something now video won't show

[TaintedTurnip]

I was editing a video, I accidentally pressed a key combination and now the blank tracks have darkened in colour and the video has disappeared from the viewing thing.

First time using Sony Vegas, so I have no clue what I did.

[t]http://i.imgur.com/Px1Yd.png[URL="http://i.imgur.com/Px1Yd.png"][/URL][/t]
[I]Picture if it helps with my explanation.[/I]​

[Aros24]

See track #8? Press the exclamation point. Pressing that will mute all other tracks other than the ones selected with the "!"