Dan,
The issue seems to be that Eleni's brushes were created using the Ipad version. I am on the desktop windows version and it appears that the brush nozzle bitmap or texture.. not sure what it is called does not scale the same when it comes into windows. I have a bunch of brushes I bought from several of the artists, actually all of them, and I know most probably create them with a Mac, and no issues. It seems to be that they were created on ipad.
Specifically 3 brushes really have issues. Soft Noise Texture 1, Soft Noise Texture 2, Soft Noise Texture 3. I cannot use number 2 or 3 with the Pixel tool at all. Which is something she recommends in her documentation. There are some quirks with the some of the other brushes as well, and if I play with the scaling and make the size much larger it starts to work.
I will make a video of it.
Thanks