Piwik display part of admin pages

Hello
I made a fresh new install on a new server (v1.6) but on parameters pages piwik only displays part of them :
On user or websites pages on have first part but not the bottom part allowing me to add users or websites
[attachment 442 piwik-3.jpg] [attachment 441 piwik-2.jpg]

On General setting I don’t see the settings but only the bottom part allowing to opt-out
Print screens attached

[attachment 440 piwik-1.jpg]
I don’t know how pages are generated: any idea what could prevent them to display in full ?

Thanks for any idea

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