Uncaught OAuthException: An unknown error

FYI for anyone else having this problem. I was getting this very helpful message "An unknown error has occurred" when trying this:

try{
    $me = $fb->api('me/');
}
catch(Exception $e) {
     drupal_set_message('Message: ' .$e->getMessage(), "error");
}

for some reason now you have to format it this way:

try{
    $me = $fb->api('/me');
}
catch(Exception $e) {
     drupal_set_message('Message: ' .$e->getMessage(), "error");
}

and it now works. This seems to have just become a problem in the last 24-48 hours.