Misaligned alignment for the arrow icon in the page path

Starting from Confluence 3.5.x until to the latest Confluence version (4.0.5), the alignment for the arrow icon in the page path seems to be misaligned to the bottom instead of being at the middle for IE 8.076 browser. See this screen shot:

The normal alignment should be something like this:

This problem only happens in IE 8 as Firefox 8 has no problems.