I am having a problem in building my solution in VS2008. Normally, it compiles fine in the environment. Sometimes, it fails with:
/xxx_WEB/secure/CMSManagedT
For me it was registering the aspx page on the master page as well.
For example (in the master page):
<%@ Register Assembly="MyPage" Namespace="MyPage" TagPrefix="MyPage" %>
...
And then in the aspx page:
<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true"
CodeFile="MyPage.aspx.cs" Inherits="MyPage" Title="Untitled Page" %>
Removing the Register fixed it.