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As of version 2.2.21, the export file downloads with a .nff extension. And, at least for me (using sqlite instead of mysql), is not in a csv-compatible format.

Correction: when downloaded using the Export option, the file is downloaded with an .nff extension and unusable. However, when using the Download All Submissions button from within the View Submissions tab, it downloads as a .csv and is in a compatible format.

Actually, it turns out the solution is much easier than I expected. The CORRECT url is returned from the Twitter account/verify_credentials call which is triggered when creating the new WP user. So, the only change that needs to happen here is to replace the update_user_meta call ref’d above with following (I left the prev/broken code and just commented it out):

//update_user_meta($ID, 'twitter_profile_picture', 'https://api.twitter.com/1.1/users/profile_image?user_id=' . $resp->id . '&size=bigger');
update_user_meta($ID, 'twitter_profile_picture', $resp->profile_image_url);

Hope this comes in handy for others!

This issue seems to be a common one when using alternative databases. For me, it was resolved by this:

Find dbDelta($sql); in plugin file “index.php” and replace it with

//dbDelta($sql);
$wpdb->query($sql);

The solution was found here: https://html5.svnlabs.com/faqs/fatal-error-call-to-undefined-function-dbdelta-in-wp-contentpluginshtml5-video-player-with-playlistindex-php-on-line-211/

An alternative option is to try:

//dbDelta($sql);
mysql_query($sql);