Menu font background color is white

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http://askubuntu.com – Something happened to my theme (I guess) where all the menu's font background color is white. This is for all menus, right click mouse menu and that top menu bar. I'm new to Ubuntu and I'm trying it out. I was following some instructions on changing themes ...something about installing gnome 3.4. And now my menu's are all messed up. When I try and use Ubuntu Tweak to change the theme it won't let me select a different one. It's just stuck on Ambient. I saw the setting to unlock themes but that doesn't help. The option menu pops up with the list of different themes but I am not able to select a (HowTos)