sh404SEF multilanguage and JFBC Comments

Hi all,
just trying to set up a joomla 1.7.3 up to date with sh404SEF taking care of the multilanguage functionality. Everything seems to work fine, with JFBC seamlessly taking care of like and fan boxes, user login and registration ... but for the Comments, that I setup to show on all articles, I get a Facebook's warning saying : Warning : [link to fb debugger] http://(my article's url) [/link] is unreachable.

Going to facebook's developer's debugger, it says:
Critical Errors That Must Be Fixed
Error Scraping Page: Bad Response Code (redirect)
Errors That Must Be Fixed
Missing Required Property: The og:url property is required, but not present.
Missing Required Property: The og:type property is required, but not present.
Missing Required Property: The og:title property is required, but not present.
Circular Redirect: Circular redirect path detected (see Redirect Path section for details).
Warnings That Should Be Fixed
Inferred Property: The og:url property should be explicitly provided, even if a value can be inferred from other tags.
Inferred Property: The og:title property should be explicitly provided, even if a value can be inferred from other tags.

It happens on every article that has a locale prefix on the url, but not on those coming from default language, which are shown without the locale prefix.
I am unsure of who is causing the problem. sh404SEF seems to work ok for everything ... and if I turn it off (and activate the language selector system plugin) the warning from facebook does not appear on JFBC Comments.

I have all the Open Graph functionality disabled, and I am using sh404SEF in .htaccess mode ... as usual did all the step by step parameter settings trial and error with no further results. Any idea ?

Got it !! in sh404sef advanced settings tab, I disabled all 301 redirects and now everything is working fine !!
Thanks for reading

I.