Daniel Herring dherring@tentpost.com writes:
Selecting "ellipse" and then clicking on the canvas results in "Attempt to invert the probably singular transformation #<CLIM-INTERNALS::STANDARD-HAIRY-TRANSFORMATION 0 0 0 0 266 185>. [Condition of type CLIM:SINGULAR-TRANSFORMATION]"
Your problem was trying to draw zero-radius ellipses. I fixed this so it's now possible (though they obviously aren't visible).