Smoothing not being applied to all histograms in posteriors plot.

In the protserior histogram plot, only some of the histograms are being smoothed. 

To see the effect, run DREAM on one of the demo projects. Then, in the Bayes plot histogram window, toggle the 'apply smoothing' checkbox on and off. Some of the plots will show obvious smoothing being applied, others will just remain as normal and not be affected by the smoothing at all.