When I am sketching a rectangle (or any closed linear
geometry) SolidWorks draws it as four individual lines rather than
a single geometry and the corners are not necessarily closed, that
is I have to sometimes select the corner points and merge them to
close the rectangle.
Also if I drew a line starting at one of those corners, the point
would turn red making me think I am coincident with the point &
it may appear so, but on zooming it I see they are not.
Any help is appreciated, I am using the 2007-08 Student Edition.