Is the weightmap node brush broken?

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In version 4.09 and 4.10 of Daz studio. I select some clothes from V4. I then covert them to TriaX Weight mapping. Then in the WeightMap tool options I can see various weight map paints however the brush doesn't appear to work I can't see a brush, can't adjust its size and clicking on the vertices of the weight maps does nothing to them.

 

I seem to remember this used to work. Is this a bug I can't find any documention.. for instance a lot of youtube vids refer to the weight map brush and not the node wieght map brush. So has something changed about weight map editing that I'm missing here?

 

 

Richard Haseltine

Someone said Window>Workspace>Update and Merge Menus helped