In Mma v9 the spacing between the BoxWhisker and the frame can be controlled by BarSpacing.
For example:
data = RandomReal[50, 200];
BoxWhiskerChart[data, Frame -> {{False, False}, {True, True}}, BarSpacing -> 0, BarOrigin -> Left, AspectRatio -> 2/3]
gives the following output in Mma 9:
But in Mma 10 (even after adding “PlotTheme → None”) the result is:
Note that this undocumented change in behavior also ruines the aspect ratio.
Is this a bug or a fix in Mma 10 and what other ways are there to alter the distance between the bar and the frame?