Can't believe you guys didn't pick this up during beta testing.....
I have a full HD resolution screen 1980 x 1080 (pretty common these days) and windows 7 which by default has the text/icons/windows on the desktop set at Medium (125%) so they are easy to read.
Norton 2012 GUI is enlarged under this setting(unlike NIS 2011) and thus the flip doesn't work when performance mode button is clicked on.
It does work when text size set to smaller....!
Can or will symantec fix this.....as i'm sure many users on windows 7 with high resolution screens use the medium setting..