Ok, I'm messing with this a little more now, and it seems to happen when I load up one effect, then load another, then load the first effect again. I do this alot when I'm working on an effect, I like to load other effects to get an idea of what was done, then go back to editing my effect.
EDIT: Also, I selected new effect, then deleted the emitters that were there, and on the last one, it froze. It seems it didn't like not having any emiters/beams in it.