Hi Dan,
1. you have problem with the cron job and I get this error :
(Unknown column 'storage' in 'where clause' SQL=SELECT * FROM `ulv8_community_files` WHERE `storage`!='s3' ORDER BY rand() limit 5)
but actually the email invitation already sent to my email succefully.
2. I know why the uploading is not working because I found this error :
(Unknown column 'filepath' in 'field list' SQL=INSERT INTO `ulv8_community_files`
(`name`,`groupid`,`discussionid`,`filepath`,`filesize`,`type`,`storage`,`hits`,`creator`,`created`) VALUES
('sarah','98','63','images/files/discussion/63/f89c2a1f8f7f69d341f563ff7e586517.jpg','5272','images','file','0','852','2014-06-23 04:33:11'))</h3>
3. This issue caused by your joomla template, seems your Joomla template is not supported with bootsrapt, I tried use beez3 template and seems working fine
regarding issue #1 and #2 I need phpmyadmin access for fixing it.