Particle Editor not using Particle Sprite

May be I'm doing something wrong, (I haven't been using Visionaire that long) but when I'm in the particle editor and set an image for a particle it seems to be fine. But when I set the Particle System's background, the particle sprite get corrupted and seems to change to a screen grab of the main window.

I'm on OS X 10.10.1 using Visionaries 4.1 fully registered. Thanks.

James