It seems silly, but I’ve seen co-workers load up a website for the first time and the site cannot located certain pages even though they are available in the file system.
This can throw you off a bit, especially when other developers have no problems. Often the first thoughts are around project settings, etc.
I advise that you first check that there are sufficient permissions on folder where the website’s files are stored. If you’re in a dev environment, maybe open it up to everyone and then whittle it down to a safe restriction.
Until next time!