DIV with negative top floating above TabLayoutPanel

Hi,

I was hoping someone could help me with a very strange issue.  We have a TabLayoutPanel sitting inside a VerticalPanel.  This in turn is in a dialog. 

There is a strange div floating above the dialog as shown in the picture below :

The div is invisible, I used the web tools to highlight it.  If it is over a button however, it prevents clicks etc.

I can inspect the element and see if is part of the TabLayoutPanel as shown in the picture below :

Does anybody have any idea what this is and how I can get rid of it?

The browser is running in standards mode and the RootLayoutPanel is being used.

Many thanks!

John

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