URLS not redirecting anymore

[outbound]

I had a working installation last I checked, but today when I created a new URL, it redirected back to the index page.

Then I realized that ALL shorturls are redirecting back to the index page.

I had the Redirect-Index plugin installed, which I took off, but the problem remains.

I'm tech inclined, but not a dev. I can't see anything wrong in the config.php file
I can create new short urls, but they don't redirect to the right url, just to the index page.

How do I troubleshoot/fix this?
Running on a web host with Nginx, DirectAdmin

Thanks much.

[outbound]

Solved
My nginx conf file was missing the yourls-loader.php after a backup was restored

try_files $uri $uri/ /index.php?$args /yourls-loader.php$is_args$args;