In the above, the icon images themselves are the same size in pixels. However, the horizontal spacing of the buttons is about 25% bigger in the WIP (for no real reason I can see).
Also the text font on the buttons with text has changed quite noticeably, it’s about 25% higher and 35% wider than in V8.
Lastly, the icons are still somewhat blurrier than in V8. Below at 400% in PS:
Bonus bug with regards to the icon spacing perhaps… since that pushed a few buttons outside of the vertical space I had for my toolbar, I had to remove one so now it looks like this:
The “Extra Tools” pop up menu is not accessible at all since it itself overflows into a pop up menu (and I notice that overflow menu displays the icons smaller than in the regular menu).
And if I reduce the icon spacing, the Extra Tools pop up menu appears, but doesn’t show all contents (it itself overflows and also isn’t single column which makes it much more difficult to use in V9 compared to V8).
I can try to reproduce if you can run Reset in Rhino 8 (without actually resetting anything) and hit the “Save settings for support” button, and send the resulting zip.