I got this issue when trying to access my sitemap:
Error loading stylesheet: An unknown error has occurred (805303F4) https://www.mysite.com/wp-content/plugins/all-in-one-seo-pack/sitemap.xsl
This is my site condition:
1. My site using SLL when accessing login and admin area.
2. The 'sitemap.xml.gz' works great without issue.
3. This happen when I set it to show only post pages, so there's no tags or categories on sitemap.
Hope someone tell me how to fix it.