Rhino 7 block paste issue


Every time I paste a block instance from one Rhino instance to another the block first appears to be missing some geometry. However if I paste the same instance again it asks whether I would like to update the existing block or create an additional instance and regardless of the choice I end up with two identical block instances. Meaning the geometry in the first block suddenly also reappears. This started with the update to Rhino 7 - have there been any other reports of a similar issue and is there perhaps a fix I could apply?

Many thanks