Oh yeah, I have it crash all the time especially when doing the kind of editing
I do, but clearing the cache helps and just restarting the editor a couple of
times clears the memory and if that do not do it I undo the changes I made.
Here is another thing called the Clone tool
The object will be created in the middle of the screen so always have your camera angled down. So once you found where you want it:
Rename it. (A Tip: you can use the "InsertKey" instead of selecting clone
from the menu too)
Then go to the properties menu while new Object is selected and ad so
new numbers, Kill rings and Division markings etc.
Take your time and enjoy!
ZW