See top of image menus are duplicated, plug in only installed once for each plug in.
Version 8 SR3
(8.3.23346.14001, 2023-12-12)
Evaluation
From your image, I think you mean menus, not toolbars… perhaps correct the title and your message…
Thanks for keeping me right.
If you run the Menus command in Rhino do you see the duplicate entries in there? You can probably delete them if so, but I don’t know how they got there in the first place.
Same here. Is there any fix for this?
Rhino 8 also occasionally crashes when I just
hover the mouse over one of those menus.

This should be fixed in the latest 8.3 release candidate (Jan 2 build)