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But we are having the same problem when we try to invite through the mail in events invite friends.module.
When we tried to edit the event we are not getting the option to "Allow guests to invite"..
Find Screenshot here in this link:
awesomescreenshot.com/0c329nkvd1
Can you upgrade you Jomsocial to the latest version (3.1.0.2) because i saw your jomsocial (2.8.4.2) version was too old.. :)
Don't forget to backup or you can try to install on your development site first.. if you had been upgrade and the problem still persist, please let me know :)
I'm sorry for late reply... I'm so sorry because we can't test this issue since we only had latest version of jomsocial.. if we do a test on your live site, it would be so risky.. :(
We have not received any response back from you in over 7 days, and would like to know if you consider this issue to be resolved. If you have any further questions, simply reply to this post.