Small Search Input Box disappears when activating the "SharePoint Server Publishing" feature

Hello,

  In a SPWeb, I activated the "SharePoint Server Publishing" feature. Just after this activation, thesmall search input box disappeared. When I'm trying to deactivate the feature, the search box doesn't re-appear. The search box is still available in the other SPWeb of the current site collection. When I activate the feature on one of those SPWeb, I get the same issue. I didn't suceed to find the solution on Google or Bing. Could anyone help me, please?

  Here are some additionnal details:

    - The small search input box is included in my MasterPage (very close to the standard v4.master) using the following code:

<asp:ContentPlaceHolder id="PlaceHolderSearchArea" runat="server">	
<SharePoint:DelegateControl runat="server" ControlId="SmallSearchInputBox" Version="4"/>
</asp:ContentPlaceHolder>

  - Here are the available/active features on the site collection:

Advanced Web Analytics -> Active
Content Type Syndication Hub -> Inactive
Custom Site Collection Help -> Inactive
Disposition Approval Workflow -> Inactive
Document ID Service -> Inactive
Document Sets -> Inactive
In Place Records Management -> Inactive
Library and Folder Based Retention -> Inactive
Office Web Apps -> Active
Open Documents in Client Applications by Default -> Active
PerformancePoint Services Site Collection Features -> Active
Publishing Approval Workflow -> Inactive
Report Server Integration Feature -> Inactive
Reporting -> Inactive
Search Server Web Parts -> Active
SharePoint 2007 Workflows -> Inactive
SharePoint Server Enterprise Site Collection features -> Active
SharePoint Server Publishing Infrastructure -> Active
SharePoint Server Standard Site Collection features -> Active
Three-state workflow -> Inactive
Workflows -> Inactive

 - Here are the available/active features on the SPWeb:

Content Organizer -> Inactive
E-mail Integration with Content Organizer -> Inactive
Group Work Lists -> Inactive
Hold and eDiscovery -> Inactive
Metadata Navigation and Filtering -> Active
Offline Synchronization for External Lists -> Active
PerformancePoint Services Site Features -> Inactive
Pivotal.SmartClient.Portal.TeamSite -> Inactive
Report Server File Sync -> Inactive
SharePoint Server Enterprise Site features -> Active
SharePoint Server Publishing -> Active
SharePoint Server Standard Site features -> Active
Team Collaboration Lists -> Active
Wiki Page Home Page -> Inactive

Thanks in advance.