Draftsight Incaccuracy

After downloading and activating Draftsight 2017 and more particularly SP1 the program is behaving inaccurately when snapping to any snap point.  The program tells me that I am hovering over the snap point but when clicked it does not snap to the desired point. It misses irregularly.  Is there something I have missed in the setup or is this a known problem with a fix? Please help.