moving inserted block

Hi,

I have been using Draftsight for sometime,

and it's an amasing free software.

The problem I am facing is:

When I insert a drawing made by me previously into my new drawing, there is no problem so far.

But, when I try to move either the inserted block or the drawing I am working on,

Both disappear from the screen, and the only thing I can see, is a line stucked on my cursor.

I am sure I am doing something wrong, But I don't know what it is.

Thanks for reading.