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When adding a popover component to a touchkit UI, and despite the html aand css are generated properly, the popover fails to appear. When shown relative to another component, the triangular 'callout' part is shown, but not the rest of the window, which is rather wierd. We're using Touchkit 4.0 with the default widgetset and theme in Vaadin 7.5.9. I have added NO custom CSS of my own and this issue is repeated on all browsers, so I guess others must have suffered from the same.