Gnome 3 - Old fashioned buttons and menus

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http://askubuntu.com – I've upgraded to Gnome 3 and the problem I'm facing is that when I restart, sometimes the menus and buttons look old-fashioned like this: http://i.stack.imgur.com/AxxT1.png whereas sometimes, it looks modern and neat like this: http://i.stack.imgur.com/YCxm3.png Notice the differences between the two: here are a few differences: 1. The menu bar (notice the difference in fonts, dark grey color of Snapshot1 vs the light grey color in Snapshot2 in the background) 2. The file navigation bar bellow the menu bar (notice the 'Home' button there and also the left arrow button) 3. The left-hand side (HowTos)