Drawing a line to a polar intersection esnap problems

Hello, I just started to used draftsight and I can't seem to figure out how to get a line I'm drawing using the polar tracking feature to snap to an intersecting line on the polar degree I have set.  For example, lets say I want to draw a 45 degree line starting at the bottom left esnap of an already drawn rectangle and drop the endpoint of my line where that 45 polar intersects the top line of the rectangle - I have found nothing that will make the intersection esnap light up when I cross the top line on the polar degree tacking.  Seems strange that I can't figure this out.  This is also happening on dimensions also which is really annoying because sometimes I need to take dimensions from areas where there are no endpoints/midpoints/etc.  I just want to dimension from endpoint to the polar intersection of another line.  PLEASE show me the way.  This such a major part of what I do with the software and If I can't figure it out I'm going to have to move on and I don't want to because I love everything else about it.