Move/Copy Hole Does it only ones and deletes the entire object

Hi ,
I’m designing a simple house in Rhino for Mac
When I make a hole for the first windows works, for the second I had to try multiple times, but finally got it and when i did the third window the entire building despairs.
I did try with another object and after the second copy does the same thing
Any suggestions ???

Hi Nencho-

Can you please give more details? What commands are you using? What types of geometry are you operating on, etc? The more detailed instructions for replicating the steps you are taking, the better.

-Dan