hi tara, thank you so much for responding me. while i’m desperating i try delete the new version of wordpress and re adding an old back up (with version 3,8) and seems work ! meanwhile my serve host tell me that the site is ok and it’s not a hosting fault.
so know i’m wondering if it’s only for some problem with the version 4.1 or what.
i think now i’m fix the problem but you think it’s better to keep the version 3.8 instead the 4.1 ?
thank you so much for your kindness and support