There is a pixel image inside the brush. Is this how it's supposed to be?
I would just put the shapes into the brush and then add glows or blurs to the path after applying the brush to it.
This is what I have found as well.. It's actually an application of a Screen effect, so it's being rendered out as a raster object (flattened), even though it's trechnically "clear". My guess is this was accidental, and it does seem corrupted.
I recreated the brush from the ground up, and although mine had exactly the same effects, it worked just fine (which is what she mentioned was the case before the crash)
My guess is, if she reimports the brush from an older "good" file, then deletes and replaces the old one, all will be fine.