Since upgrading to the new version of draftsight2017, my mouse will not work properly.  I am working on a MAC system.  When I open a drawing, choose a toolbar such as delete, my mouse will not click and drag to highlight multiple entities at once so I can delete them all at once.  Also, when I click on a menu option such as create a line, I get an arrow which i have to click to get a crossbar to create the line.  I cannot find how to change these in the preferences options.  The tutorial says you should be able to use the mouse gestures option on the tools menu and when you look on the tools menu, the mouse options is not listed.