Both V5 and V6 WIP:
create a file that contains a block instance
make a new file, insert the first one as linked block definition
the BlockManager will show the name of reference block if “Show the reference block definition” is checked
double-click to edit - Rhino will lock and new instance will open to edit the referenced block file. No need to change anything, just SAVE.
Repeat #3 a few times.
Every time the externally edited block is saved and we are back to main session, the list of Reference block definitions in BlockManager grows, and adds a numbered suffix to the referenced block name.
Once the main file is closed and re-opened, the list is back to a single reference block definition name.
Can anyone repeat that problem?