I've experienced this bug too - I have a MacBookPro 8,2, with the latest updates. I was trying to lower the intensity of the keyboard backlight (on the F5 key, but to get a real F5 I have to press Fn+F5). My theme disappeared, scrollbars and buttons reverted to "old look".
I've experienced this bug too - I have a MacBookPro 8,2, with the latest updates. I was trying to lower the intensity of the keyboard backlight (on the F5 key, but to get a real F5 I have to press Fn+F5). My theme disappeared, scrollbars and buttons reverted to "old look".