If you're in Monochrome Draw or Color Set Replace drawing mode, and you have either the circle or ellipsis tool selected, the tool automatically changes to the Line Tool when you click on the Gradient Draw mode. The tool should stay on the circle or ellipsis tool as they are valid tools to use with Gradient Draw mode. It's a nuisance to always have to change it back to the circle/ellipsis tool you were using before selecting the Gradient Draw mode (I often forget!)
If you're in Monochrome Draw or Color Set Replace drawing mode, and you have either the circle or ellipsis tool selected, the tool automatically changes to the Line Tool when you click on the Gradient Draw mode. The tool should stay on the circle or ellipsis tool as they are valid tools to use with Gradient Draw mode. It's a nuisance to always have to change it back to the circle/ellipsis tool you were using before selecting the Gradient Draw mode (I often forget!)