According to the documention, to close an intelligent scissors area and make it
selected is to connect back to the first point.  When you mouse over the first
point the mouse cursor changes indicating that you are over the it so you would
think that clicking there will close the selection.  Unfortunately, you actually
have to click on the very tiny white dot inside of the black point, which is
almost impossible.  Very frustrating when you spend a few minutes going around a
complex object and then fail to close it at the end and have to start all over
again.  Not being able to remove the control point that you put on there doesn't
help matters either.

Why do you have to click on that tiny white dot to connect two control points? 
It should just be as simple as clicking anywhere on the large black dot of the
control point, especially when the cursor misleading changes making you think
that you are over it.