I am experiencing a problem when a custom module I wrote performs a post-back. What is happening is that the module visibility page setting (which is set to None for my container) re-appears after the post back. Upon further investigation, I noticed that someone added EnableViewState="False" in
~/Admin/Containers/Visibility.ascx. I think this is a bug. I would recommend that the file be changes back to the way it was. The complete file should be:

<%@ Control language="vb" CodeBehind="Visibility.ascx.vb" AutoEventWireup="false" Explicit="True" Inherits="DotNetNuke.UI.Containers.Visibility" %>
<asp:LinkButton ID="cmdVisibility" Runat="server" CausesValidation="False">
<asp:Image ID="imgVisibility" Runat="server"></asp:Image>
</asp:LinkButton>