This exact question has already been asked here:
URL Rewrite resetting "Permanent" redirects
But it hasn't been answered yet. This is my first time on this site and I wasn't sure if I should ask a whole new question or 'answer' the other question with the same question.
Basically, I set up URL Rewrites for my some of my categories but they get reset on indexing and (possibly) when I modify categories.
Can somebody please tell me the best solution to this?