Running Evo 1.1 which I upgrade to from 0.9.6 a few weeks ago - all works fine apart from the children resources of one container... When you edit one of these child resources and hit SAVE, or go to update the page template - I see the front end custom error page in the RHS of the CMS - looking at firebug - it shows a /manager/index.php 404 error - page not found??? Saving resources elsewhere works fine...
Any ideas what the issue might be? Cleared cache and checked error-log but nothing helpful there...
Seems this was a mod_security thing at the hosting company - the action of saving the resource was triggering a remote content injection alert - worked with hosting team to resolve and now all ok... Odd!