I started managing a blog with Processwire (3.0.65). Some of the pages don't update. These are just standard blog articles and I am unable to alter them in any way including delete. This only affects a handful of pages without any ascertainable connection. I don't know if it is a server issue or a Processwire issue. I need help troubleshooting.
A friend thought that mod_security might be the culprit, but it appears to not be triggering. The site is hosted on a VPS at MediaTemple.