My tests were done on Windows 7 PC as well, but I don't believe that the problem is related to the OS - our controls are OS independent. I repeated the test and as you will see in the attached (in the ticket) movie, I am still unable to reproduce the problem (the jumping of the browser's page is due to the fact that I am using 2 monitors and you have a code that moves the browser to position 0,0).
This leads me to believe that the reason for the problem might be related to the browser itself - try your page on a different machine with clean IE or disable any third-party addons that interfere with the page.
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