I am currently trying out DXO PhotoLab 2 and as far as I can see the "Brush" button is missing (? -or am I just missing something obvious?). I know that the Nik filters can be applied selectively using control points, but I find brushing in quite handy at times. The Nik plugins, including the brush feature, work fine with the latest PSE, so it seems odd that the feature doesn't seem to be available when using DXO Nik within a DXO product.
Julian