This fix apparently scrambled something else.
See the result of
image bounds(10, 102, 373, 58) corners(5) colour(30, 30, 30, 255) outlineColour(255, 255, 255, 100) outlineThickness(2) channel("image100")
image bounds(10, 166, 373, 58) corners(5) colour(30, 30, 30, 255) outlineColour(255, 0, 0, 100) outlineThickness(2) channel("image101")
image bounds(10, 166, 373, 58) corners(5) colour(255, 100, 0, 30) outlineColour(255, 0, 0, 100) outlineThickness(2) channel("image102")
in build #20210708.3 Merge branch ‘develop’ of GitHub - rorywalsh/cabbage: Framework for developing audio plugins with the Csound programming language. into develop (left) and #20210708.4 fixing outlineThickess issue for image widget (right)
There is some transparency change and
note also the line thickness change.
No stress if you don’t manage over the weekend 
I’ll make use of an older build for now, because I hardly see my widgets now (transparency issue).