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The problem there is that you've previously experienced, these problems because your application settings on your facebook application error still exists.
Maybe there are still some fields that have not been filled in correctly.
Below is a capture of the facebook apps development and see which are marked with red color
Attachment setting-basic.jpg not found
Attachment setting-advance.jpg not found
Attachment setting-migration.jpg not found
Attachment statusReview.jpg not found
Attachment app_details_2014-03-21.jpg not found
if there is still not understood or can not, please give me your facebook account so that I can that setting
Thank you so much for the detailed response! I did fill in missing fields in the Facebook app preferences but I am still getting a blank pop up screen on the site both on the home page login and the JomSocial main page login.
Ah, i got caught by facebook security questions.. i can't login to your facebook account.. Can you help me to activate your FB connect using your API key and Secret Key? by the way, i can't login into your administrator page.. did you changed administrator login??
I apologize for not getting back to you sooner. We apparently had a real issue on our forum and some posts simply were not visible for us. I realize this is very late, but is there anything we can do for you at this time? Do you still need help with this issue?