Stem Thickness broken in 3087

G3.0.3 [3087] OSX 10.13.6.
Stem Thickness is erratic now. Works fine for a few seconds, then stops. Clicking another few times may cause it to work again, but only for a few seconds.

I fixed it. It needed an update to Glyphs and the plugin. The plugin is out already, Glyphs will follow tomorrow.