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Here's how to reproduce these conditions: 1) Draw some rounded rectangle. 2) Unlink the corner radius values and make one radius really big. 3) Re-link them again and make that big radius smaller again. The other corner radii will follow and while their values won't go below 0 in the input fields the actual shape will get distorted: Also after doing this my Rectangle tool (not Rounded Rectangle!) looks like this, although the shape snaps back to regular corners once it's been placed on the document: Using "Reset Tool" from the preset menu doesn't fix this.