This morning when I went to view my wiki I noticed that none of my pages had content. The title and everything else was there, but the articles themselves were gone. Upon further inspection, I can still view the content if I hit the "Edit" tab, or "View Source".
I attempted to follow the instructions in your help section, to no avail. I have absolutely zero idea on how to even begin going about downgrading the PCRE version (something which I didn't even know was a thing until today), and my attempts to update to the latest version of MediaWiki hit a brick wall because the problem I'm having is causing installation instructions to not display.
How do I fix this problem?
I'm running on 1.21, and my PHP version is 5.4. Any other info I may have forgotten, let me know.