Brushes not showing up

Hello, this is really frustrating!

I'd already imported a lot of brushes, but they all disappeared, and I'm left with the defaults! When I upload the brushes again, it just doesn't show up. I've uploaded them 4 times already.

I have this almost-completed icon, and all I need is a heart brush, and it makes me go "GRR!! Damn PSP!!"

Please help. =)