Barish: I am glad you like them all, some of them have taken me so much time!
About the box problem, I was having a similar problem with a star object I was making. Your post reminded me of it and so I did a little digging and found it to be a very simple code issue. I will fix the code and re-load it into mediafire which should fix this problem right up!
EDIT: The improved code is now up, just re-download and replace your old files
If any other particles do this, please let me know and I will fix them.