I’ve had exactly the same issue twice. Photoshop crashed , then opened again and all the brushes were gone. The only solution was to re-load the back up of the brushes... form months ago unfortunately.
This seems to be a bug in Photoshop and looks like it is still not resolved.
I tried to look for the folder where Photoshop stores the brushes (Mac) but couldn’t find it.
I've just had the same issue!
To be clear, this is not a matter of not knowing how to load brushes, it seems to be connected with the Kyle brushes that were recently implemented into CC. Like just now, theyve all vanished! Except...there are ghostly remenements of Kyle brushes 'leftover' in my recently used panel, but not in the main panel??
so this is what I see now - notice 'General' 'Wet' 'Dry' etc. Anyone who's downloaded all of Kyle's brush packs can see i'm missing hundreds, so why are these ones spared? Why do I still have these ones? I havent saved these as a set theyre just...leftovers from a crash?
Try to load them in again, and PS takes you to 'Brushes' where they should be, but theyre gone. There's nothing in 'Tools' either
So to add to the mystery, before Kyle became part of Adobe I bought and downloaded 'Brushbox' as a PS plugin, specifically so arrange all of kyle's million_and_one brushes. It worked like a charm, but then of course a month later with the Kyle update to PS we got them arranged anyway, so the developer Derrick Barth had to go update his plugin for us.
When I use the Brushbox plugin now I can see all of Kyle's brushes still?? So theyre still here just in my plugin not in the main section?
So this is basically a lifesaver as i'm in the middle of a deadline. This seems like a bug, and its not really a solution to 'Just download them all again' - It takes ages to download and re-arrange (AND rename because all your brushes start with 'Kyle...' 'Kyle...' 'Kyle...') hundreds of brushes. Seems like a bug to me