This is an internet explorer only bug. I'm currently using IE7.
I'm having the same problem that appears on YouTube page.
There is "Home" "Video" "Channels" under the search text field at the top of youtube.com page.
The padding that exists between Home and Videos gets ignored when we increase or decrease the font.
The page I'm developing has the same bug, and it looks even uglier because I have background images for "Home","Video", and "Channels"
Does anyone know how to fix this problem?
Thanks!