blank page on facebook connect in an emmbeded browse on iphone

Hi,

I use joomla + joomsocial + JBFconnect

All is ok on desktop site

I write an iphone app with native embedded browser.
When I try to log with facebook connect in embedded broser I get a blank page.
When I use safari on ihpone all is ok

I suppose this is a problem with redirection during login process...

Any sugestion ?

Jack