Selecting specific gradients does not change it. Perhaps it is a retina UI thing?? I have an old iMac with a non-retina screen (full-HD). Perhaps it is not rescaling these things correctly, as the brush pop up window also looks a bit strange: it is wide so it could fit two brushes side by side, but there is only one. Sometimes some items in the list align to the left, while the rest is in the middle. I guess it should look like the window in the iOS version, with two columns? See the screenshot attached to see how it looks now.
I am sorry, I have a rather old mac, so perhaps these issues can be contributed to this. I still hope you can solve it, as I would like to use ASP on a Mac, but these issues are rather nagging. Thanks!