Scene based illumination + non-shiny materials + GI = wait for an update

1000 point question: what's wrong with these pictures? Hint: the steel can be satin or matte or anything-but-polished metal. Another hint: if I trash that kitchen environment and replace that window with a white LED panel, it renders fine. Please help.

[click to enlarge - can't see the problem otherwise]

SolidworksPhotoview 360