Tear off palettes (containers) are sadly orphaned in R8 (8r4)

,

Containers (palettes/tear-off tools) become orphaned when a windows is closed, leaving behind a sad, empty round rect blotch. Tear-off toolbars also change with multiple windows. This is new to R8 for Mac. On R7 the tear-off toolbars were persistent, parented to the menubar not the window. In R8 they are parented to the ?window, leading to strange behavior.

hi @tshine thanks for reporting,

Looks like two different issues are at play here.
RH-79747 Floating toolbars (Containers) are tied to Rhino Window
RH-79748 Floating Containers leave traces when Rhino Window is closed.