Start point off screen on Mac OS

I have just bought a new iMac and downloaded Draftsight (which I have been using on Windows previously). I have the toolbars at the top of the screen and when I select a command the start point is off the screen, in the area of the command button. Also the pointer and cursor are both visible at the same time and scrolling is very jumpy. I tried using my old mouse rather than the apple one but the problem persists. I have also moved the tool palettes off of the drawing screen but it hasn't helped.

If anyone can help I'm very grateful!