Mysteryious White box

[bluewalrus]

There's a random white box that appears in flock (not Firefox surprisingly) and Opera on my site. The dragonfly/Firebug say its in the ul id nav but I can't figure out what it is. The positioning is different in both browsers and only it is only in these 2 (probably ie as well) browsers. I made a video in case you see something weirder... This is what I see in safari (being the normal view), Flock and opera.
http://www.screentoaster.com/watch/s...bRVxdUlJa/demo

The site is http://travelinchucks.com and it's in the top right in the nav bar over the banner. Thanks for any ideas you have.

[Lpe04]

Not seeing it in IE