I've setup my application with Facebook connect (using Omniauth) and it seems to work for some accounts but for others it returns the infamous An error occurred
error.
This isn't to say it happens sporadically, but consistently for some users. Sandbox mode is off, the APP key etc. and domain are obviously setup correctly or it would always throw the error. How does one go about debugging this from a message as vague as that one?
Edit 2:
The App domain is correctly set up and so is the namespace. I have selected both "Website with Facebook Login" as well as "Mobile Web" and the URLs are correct and not HTTPS (both use the same URL). I've also reset the App secret just in case but this has not resolved the issue.