Britton,
Ok, I got one of these:
Real index -1!!!
I didn't get a "Padded index -1!!!". You're suspicion seems to have been right.
So it seems to me that you probably have a particle with index == -1. There are a few things we can try. If you have just one with -1, we can change the default 'empty' value in those arrays to something else. I suspect you won't have just one, however, at which point you're kind of up a creek, because that's absolutely required for parallel HOP. It may be worth your time to fix the -1 IDs to something unique in the enzo dataset. I should add a check that screens for bad particle index values, like -1. I've learned something today. Let me know if there's anything else I can help you with! _______________________________________________________ sskory@physics.ucsd.edu o__ Stephen Skory http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student ________________________________(_)_\(_)_______________