BUG: Cannot edit existing button's icons or commands, they are empty

hi McNeel Team,

I started packing my stuff to come to V8 WIP. One of the first things I want to do is start remaking my icons as vectors, starting form your existing vector icons. This is what I see when I try to grab artwork from one of the default icons:

EDIT: closing Rhino and restarting it solved the problem, for now.

G