This is not actually a bug but something that bugs me and can easily be fixed. I often zoom in on the page for reading and leave it there and it works great but the header is split in half since it is two images.
To keep the image together please remove the width setting in the header it fixes the issue till I zoom in about 210%.
Currently
<td class="headerbg"><div align="center"><table border="0" cellpadding="0" cellspacing="0" width="795">
To fix <td class="headerbg"><div align="center"><table border="0" cellpadding="0" cellspacing="0">
A side note that can reduce the server load some by removing the large CSS group and pushing it all into the CSS file that loads after it. That way the browser will load the .css from cache and have to download the text every time. That will save about 5.42K for each page after the first is loaded.