Problems: loading second drawing; copying/moving drawings

Hi everyone, I am using Draftsight for a while now om my MAC and I have some recurring problems:

- when I want to open a second drawing to copy elements from the program 'hangs in the loading mode (with the Turing circle). I have to close and open the program agin and again.

- when I want to copy or move a part of a drawing with multiple poly lines and/or blocks Draftsight crashes

Two super annoying problems. Can anyone help me please?

Thanks! Willemijn