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Well - assuming the situation has not changed from the above and if this is still being caused by your server throwing code 500 errors then to be honest you should probably be talking to your host because that does usually point to a server set-up error or conflict of some kind. These sort of errors can not really be diagnosed remotely like this - it needs access to log files etc., that are on your server.

The basic principle that was stated above however, does apply. When something works and then stops working it is always going to be because something changed. And that really does mean always. This might be - in terms of a WordPress based site - changes to any WP theme or WP plugins in use - or new plugins being added to the site. But it can mean changes to the server environment etc.

However - before contacting your host then checking with the script console as suggested would be worth a try in case it shows something useful. All modern browsers these days come with a console - usually from tool or development menus. These can be opened and set to ONLY show script Errors. Once set then loading a forum page and clicking on the admin bar button will show in the console window both the request to the server and the response. And if an error this will be stated. That information would be useful whether for us to try and help or for your host.