Hello,

Have you created a custom 404 page perhaps?

Regards,
Mario

I think we had added it following your instructions at http://www.mono-software.com/Mono/Pages/Discussion/dtopic/-oRV9mC-x0a65KLCAKcl4A/MONOX-doesn-t-seem-to-have-a-404-page/ (following up on a report our designer had done to this forum)

the source is:
</br>
</br><%@ Page
</br>    Language="C#"
</br>    MasterPageFile="/MonoX/MasterPages/Default.master"
</br>    AutoEventWireup="true"    
</br>    Inherits="MonoSoftware.MonoX.BasePage"
</br>    Theme="ClipFlair"
</br>    Title="" %>

<%@ MasterType TypeName="MonoSoftware.MonoX.BaseMasterPage" %>  
</br><%@ Register TagPrefix="MonoX" TagName="Editor" Src="/MonoX/ModuleGallery/MonoXHtmlEditor.ascx" %>
</br><%@ Register Assembly="MonoX" Namespace="MonoSoftware.MonoX" TagPrefix="portal" %>
</br><%@ Import Namespace="MonoSoftware.MonoX.Resources" %>

<asp:Content ID="Content1" ContentPlaceHolderID="cp" runat="server">
</br>    <div class="container-highlighter" style="background-color:#666">
</br>        <div class="container">
</br>            <div class="row-fluid clearfix">
</br>                <div class="span12">
</br>                    <portal:PortalWebPartZoneTableless ID="HighlightBanner" runat="server" Width="100%" ChromeTemplateFile="Standard.htm" HeaderText="HighlightBanner">
</br>                        <ZoneTemplate>
</br>                            <MonoX:Editor runat="server" ID="editor01" Title='<%$ Code: PageResources.Title_TopSection %>' DefaultDocumentTitle='<%$ Code: PageResources.Title_TopSection %>'>
</br>                                <DefaultContent>
</br>                                    <p>Error 404</p>
</br>                                </DefaultContent>
</br>                            </MonoX:Editor>
</br>                        </ZoneTemplate>
</br>                    </portal:PortalWebPartZoneTableless>
</br>                </div>
</br>            </div>
</br>        </div>             
</br>    </div>
</br>    <div class="container">
</br>        <div class="row-fluid">
</br>            <div class="span12">
</br>                <portal:PortalWebPartZone HeaderText="Left part zone" ID="leftWebPartZone" runat="server" Width="100%" ChromeTemplateFile="Standard.htm">
</br>                    <ZoneTemplate>
</br>                        <MonoX:Editor runat="server" ID="editor1" />            
</br>                    </ZoneTemplate>
</br>                </portal:PortalWebPartZone>
</br>            </div>
</br>        </div>
</br>    </div>
</br></asp:Content>

(the </br> is added by your forum here, still has issue with IE11)

the bug seems to be that

- when you navigate to the page directly using its url you can then edit it ok (being logged in as admin).

-  If you navigate to it via the page-not-found mechanism (give some wrong url to take you there), up in the address bar you see the wrong url you had entered (this is by design I guess) and when you move mouse over the text webpart you see that popup icon for webpart actions and clicking it you see the respective popup toolbar, but then you click edit and nothing happens

so the 2nd case doesn't work which isn't obvious to the admin and they may think they can't edit visually the page which is wrong (they can)