Thank you all, the host setting solved that problem. :)

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Hi, 
I have solved the same issue changing to Ribbonbar control panel, but now i have another problem: when i move a module from a place to another, when i change the mode from EDIT MODE to VIEW MODE it returns to the initial place.

With Chrome Inspector i've see this error:

1. POST http://demo1.italcomdemo.it/DesktopMo... 401 (Unauthorized) jquery.min.js:4
   1. sendjquery.min.js:4
   2. f.extend.ajaxjquery.min.js:4
   3. updateServerdnn.dragDrop.js:87
   4. $self.sortable.stopdnn.dragDrop.js:258
   5. b.Widget._triggerjquery-ui.min.js:33
   6. d.widget._triggerjquery-ui.min.js:273
   7. d.widget._clearjquery-ui.min.js:273
   8. d.widget._mouseStopjquery-ui.min.js:241
   9. b.widget._mouseUpjquery-ui.min.js:50
   10. _mouseUpDelegatejquery-ui.min.js:48
   11. f.event.dispatchjquery.min.js:3
   12. h.handle.i

I hope you can help me.

Thank you

I ran into this issue with a full install of 7.00.05 .   I set up an install with 6.0 then upgraded.  The issue did not appear in the upgraded site.  A side by side comparison of the web.config file showed the following was missing from the full install,

<system.webServer>

   <modules>

      <remove name="FormsAuthentication" />

     <add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule" preCondition="" />

</modules>

<system.webServer>

I added this section and the Edit button is working now.  The complete summary is on my website.