I recently changed theme and I've got some new problems with Tabbed Widgets I didn't have with K2.
My problem now is: I styled Tabbed Widgets but I can't delete the double margin there is, neither the space between the end of the Tabbed Widget master and each of their widgets. Well, I think it's much easier to understand if you take a look.
I'm not sure if it's a theme or plugin issue. Anyway with Tabbed Widgets I've always had too much space between widgets.