This problem exists for me as well, and has for quite some time. I am using VW 10.5.1 with a G4 mac os 10.2.8. When I have multiple drawings open I cannot use the "Window" column to switch between the drawings.
The correct drawing will show up on the screen when selected. But any command will not work until I slide the frame over, click on the other drawing, and then click back on the drawing I want.
Has anyone solved this problem yet??? I have noticed the same problem in ms word as well, so maybe it is a mac os problem.
thanks