I had earlier had a problem because I am physically in Korea but use English Facebook. I had to use a code for Korea in configs to get it to work. I am still getting a 500 error but when I click the back arrow in Safari I can log in.
Here is the error message
DateTime::__construct() [datetime.--construct]: Failed to parse time string (John Eberl) at position 0 (J): The timezone could not be found in the database
You may not be able to visit this page because of:
an out-of-date bookmark/favourite
a search engine that has an out-of-date listing for this site
a mistyped address
you have no access to this page
The requested resource was not found.
An error has occurred while processing your request.
Are you using any of the JFBConnect Profile plugins? Let us know which ones are enabled and, if any are enabled, please try 'un-mapping' any fields that would import into a date-type field. Hopefully, that will temporarily fix your issue. If so, also let us know what field you were importing from Facebook and into what field you were importing in your system.