I'm having the same issue with IE6 browser. It works fine on IE8 but not IE6 with sounds like same behavior as FireFox for you.
Did you get resolution to this?
In the content pane of the WebDialogWindow I am putting a user control which has nothing both a simple HTML table with 4 columns and 5 rows with no CSS applied to the table HTML element.
When I launch the webdialogwindow - I see that the height…