pigments.less not updating styles

Recently updated atom-pigments (v.0.40.2) and Atom itself (v.1.19.2 x64) on MacOS Sierra (10.12.5) and now finding changes to pigments.less file are not taking effect. All I want to do is change the size of the native-dot marker via:

` &.dot {
width: 2em;
height: 2em; ... }
`

I have restarted Atom and rebooted yet style changes remain ineffective .

This has never been an issue before, but perhaps I'm still missing something basic here.