We're getting permission denied errors for the xml sitemap generation with WordPress SEO (great plugin). It's only happening for 1 of the 8 dynamically generated xml files which is stumping us:
Here's the sitemap index:
And here's the sitemap that gives the permissions error (and blank page):
Oddly, all the other files work fine! We'd like to resolve this so we can turn off our other xml sitemaps plugin and use WordPress SEO instead and submit to Google.