ISSUE SUMMARY:
I do understand to set photos I like to share from registered to public.
STEPS TO REPLICATE:
1http://prntscr.com/b5g9x9
2http://prntscr.com/b5gfrj
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RESULT
In Facebook preview window I see sometimes that photo and sometimes I see only a blank screen. I do have an Facebook Id and I know how to use Facebook debugger. It takes Facebook sometimes more than a day to fetch photos. I am not shure if all my Public and Registered Settings are correctly set up.
EXPECTED RESULT
My goal is to share all photos, videos on other social networks.

BROWSER
Ege

HI, Peter.

This is how FB works. I have few Joomla! based sites and I share from them VirtueMart products pages or just articles.
And I confirm that in preview window sometime photo is displayed and sometime it's blank.
But each time photo is displayed on FB stream correctly.
So you should not worry if photo is not visible in share window - just check if on FB stream is fine.