I was going through this tutorial last night in 2.4:
And I got some really strange behavior. Everytime I would go into and out of Edit mode, the particle were being recalculated with some sort of ghost settings that had them blowing out of the top and bottom or out of the front and black, or even coming out of the sphere in a swirl. Like I said, really strange behavior.
This would happen everytime I would go into and out of Edit mode, and it was also happening when I was changing the original Force settings. For instance, I would finally get the particles to behave properly, then change the Norm Force from .300 to .350 and the particles would behave as I listed above. Go back to .300 and they would not go back to normal, but would show one of the ‘strange behaviors.’
So I went back into 2.37a and everything worked as it should. I have experienced the same behavior on Mac and Linux, and they work in 2.37a. Something even more odd is that when I change the particles to strands, they look beautiful, and behave as expected. In fact, I could not screw up the strands. But turn off the strands, and crazy particle behavior time.
Could I get some of you Blender(ers) to check out the blend file and confirm this behavior before I report it as a bug, please? TIA.