Well there seems to be an issue.

Have you made any changes to your db and made sure to run domain.com/db/build?flush=1 after? I had this issue where I made changes and forgot to run that, and realized as soon as I went to update the content. Could be something as simple as that.

Could also try putting your site in dev mode to see the output of errors. Add this in your config file.

Director::set_environment_type(dev);