Mouse click evokes _Mainselect command on all icons, links, etc.

I recently installed and activated DraftSight.

No matter which icon, link, or menu item I try to select the result is always the same-  a selection marquee appears and "_MAINSELECT / Specify opposite corner" appears on the command line.

Any help would be appreciated.

 

PROBLEM SOLVED.  SEE MY COMMENT BELOW.