[ubuntu] Dash Transparency problem

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http://ubuntuforums.org – Hi guys! I've a problem with 12.04 LTS Dash, the background isn't transparent, it's completely opache. It's fine if I use Unity 2D though. I'm using an MSI netbook and when I first installed Ubuntu over a month ago transparency was working fine in the default Unity desktop. I've installed various utils such as Compiz settings manager, My Unity etc, but none of them seem to set it right. Oddly if I change the background image, then afterwards the transparency works - it's as if it's not updated when I first log in. Hope someone know of a fix, as I prefer to use the normal Unity as apposed (Hardware)