ahh glad to find this thread.
anyways, my situation is just like GoRoovy.
before having v3.5.5, and having the previous one, *i don't remember that one* the brushes appeared fine. but then now, having the latest version and everything intact, the brushes do not appear once i clicked the "ok" button.
it does show a processing kind of popup message, but afterward, the brushes do not appear but in my history window it shows the action being done.
also, i read the posts in here, but i haven't come across this again besides GoRoovy, so i was wondering if anything has been done about this... or no.
or if simply it's just my computer or paint.net or whatever.
thank you in advance and i'm sorry if this was a *wasted* post.