[ubuntu] Dash & Powermenu backgrounds 'glitched'

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http://ubuntuforums.org – A few days ago i went from Ubuntu 12.10 to 13.04 Beta. It was though getting things running since my system is kind of messy. One of the problems i have run into: The backround of my dash looks glitched, and anytime i type or scroll in dash it 'blinks'. The power pop-up menu thats new to 13.04 has a similair problem. It looks to bright, you cant read any letters. There's also a square in the bottom left hand, same as in the dash. (See attachments) Does any one know how to fix this? PS. I have been using ubuntu for some time now, so getting a bit technical wont be a problem. ( A bit (Hardware)