Most of the criteria for closing questions (exact duplicates, non-questions etc.) are clear to me. Closing a question as being to localised is the one I don't think I understand. I suggested closing What could cause repeated NULL characters in an .aux file? in chat and in the comments Caramdir suggested that the question probably doesn't need to be closed. That's fine with me, but it raises the question of how do we decide this?
So what criteria should we use to close a question as "too local"?
Perhaps a related question (and I know I'm not supposed to do this) is:
What is the purpose of closing "too
localised" questions in the first place?
I'll repeat what I've just said in 'chat' on this:
Closing a question as "too localised" says, for me, that here is a question that whilst technically on topic is so unique in some fashion that we cannot imagine anyone else ever asking it or needing to refer to it. And that it would be distracting to genuine questions or answers to have it exist on the site at the same level as other questions or answers (for example, it might keep coming up in the "suggested questions" list). Of course, it may come up again, and it was asked in good faith, so maybe we won't go so far as to delete it, but it certainly should sink without too many traces in the meantime.
The issue cannot be recreated by other people (with a sane effort).
This can be because a set of unknown conditions must be come together to cause this issue.
For example it really only happens on one of the computers of the OP, but not on his/her others and he/she has no idea why.
The issue will only be an issue for a very limited time
Things like: Can't install/update TeXLive because CTAN is currently down.
Just posting this as an answer so that it can be voted on:
I think that of the possible close reasons, "too localized" is the one we need least on our site. Even if the question mentioned in the OP is rather localized, I still don't see any harm in having it around. Why? The question is formulated so that I can understand it quite well, the OP gave an understandable answer, the post as a whole look quite clean, and in fact much better than other possibly more valid questions with several answers where the OP was misunderstood.