I haven't seen this problem elsewhere as of yet. This is an internal site, so sorry, can't show the site.
What is occurring though, is when you mousover a menu item that has a dropdown, it shows the first 10 pixels or so of the top of the dropdown, then shows the rest of the dropdown 1/10 of a second later. This only occurs in IE7. The additional issue is the dropshadow also only shows on that same area, after the 1/10 of a second. It's like it's waiting for the shadow to load before it will load the menu? The dropshadow issue, where it's only display on the top is an issue in FF as well. I have a screenshot of it if someone would like to see the problem. http://www.foxtaildesign.com/images/test.png