I've had this problem ever since I moved from firefox to chrome and it's become quite annoying. Sometimes i can't see my username/settings etc on some webpages (for instance facebook/Battlelog/gmail)
It happens pretty randomly but I'm able to do it myself by resizing the windows (hence the different sizes of the screenshots)
Clipping at bottom
Clipping at top
Windows 7 SP1
Norton Internet Security 2012 19.7.0.9
Google Chrome 18.0.1025.168
Addons:
AdBlock 2.5.32
Norton Identity Protection 2012.5.3.7