Marc,
I have also observed that behavior with the comcast.net homepage, but it seems to happen only when the page is opened for the first viewing of the day. Subsequent viewings during the day result in the page being opened with the top of the page being displayed.
I have noted that the Comcast URL on my system changes from the bookmarked URL of
http://www.comcast.net/ to
http://www.comcast.net/b/
It appears that the display may be related to a cached URL, but try changing the bookmarked URL to
http://www.comcast.net/b/
;~)
