okay, so I recently bought a new graphics card, and since I bought it, everytime I play powder toy all the moving particles are flickering/disappearing, I think it might be a resulotion issue but when I paused the simulation they appear again, so screenshots won't work.
I forgot to mention I got a new moniter with it to, if that links to the problem.
I think I found out, my older monitor was using 1400x900 I think, and the new one has 1360 x 768 and it's running fine in windowed mode.
yes, I was using full screen mode.