Pen tool will not draw a diagonal line it is creating a triangle shape

Question

I created an art board 400 px x 400 px.  Then used the rectangle tool to make a blue rectangle also 400 x400 and centered on artboard.  I want to draw a 4 px diagonal line but when I click on upper left corner it is creating a triangle of white, half the size of the artboard, almost like it is doing something with one of the pathfinder tools.  I did use the pathfinder for an earlier project but it should not be an issue here.  I have tried doing a reset in properties to no avail.  Anyone have any ideas?

Brad @ Roaring Mouse · Answer

What is likely happening is that your Pen tool (which you are trying to draw the diagnoal with) is deleting the anchor point of the previous rectangle, leaving a triangle shape.

Does your pen tool change to a cursor with a minus sign beside it if you hover over that corner? then yes, that's what's happening. To override, hold down Shift to start drawing a new line from that point instead.

You can also change the defaults for this behaviour in preferences > General > Disable Auto Add/Delete

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