I'm having problems setting the background as an animation. When I select background image, I then select 001.png of 65 pngs in the same folder. But when I click open it just reopens the window I was just in to choose an image. I choose 001, 010 or even the last file in the sequence but to no avail. This problem is with pngs and jpegs. Sometimes I can work around it but other times I really do need to see the animation I'm putting the particle with. Restarting the program doesn't help.