Arrow Tool: LineWidth not working as expected when curved

[3t8U]

When using the Arrow tool with the "Curve" applied, the line width function doesn't seem to be working properly. When using the Line Width slider, it appears as if the curved arrow is just being zoomed in and out of in the preview window. Then, moving the Line Width slider on an actual drawn arrow, nothing seems to change. When using the Arrow tool without the curve applied, the tool works just fine. --- Also, I am not able to download the .sketchpad for this current drawing. Every other format of download is working though.

Thanks,
Nate