It is not listed in the Codex but perhaps the word ‘slug’ in the pages URL is a reserved word? Just a wild guess and could be completely wrong. I thought it may be worth mentioning however as others may encounter a similar problem and might be the result of using reserved words.
If you reference the link to the WordPress Codex listed below, it states when using a reserved word in WordPres: “Doing so can cause WordPress to respond with a 404 error without any other hint or explanation.”
For a complete list on words to avoid you can find these on the WordPress Codex. I believe this list is not 100% complete and there are a few other words but these are the bulk of them.
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