It's a brand new computer though, and my old one never had them updated (and was surely much older than this one) and I never had a problem like this D: but hey, I'll try anything.
Oh. When I save it, it goes through the usual saving process with the screen white, but as soon as I click "okay" on maximize compatability the brush strokes load, and yes when it re-opens the brushes are there.
They also load when I make a new layer, or turn one off and on.
EDIT: I just tried, my driver is up to date, incase it matters it's an Intel(R) HD Graphics