Got unexpained "access denied" troubles keeping people from your content? Go to admin/content/node-settings, and try the 'Rebuild Permissions' button.
If that doesn't work, see other ideas for access denied for visitors and access denied for admins.

Glad it helped. FYI, I've confirmed now on several sites that my Read More hassles are solved.
I don't know why such a simple problem plagued me for so long... except that throughout it all, I went through different versions of editor modules, different versions of Read More Tweak module (now re-named Read More Link?), alternate modules like Node Excerpt, and of course, different versions of Drupal. So, while I never log these problems in enough detail that I can look back and be certain, I think the failure of this issue to work correctly on my sites hasn't always been a matter of dumb user error. : )
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Got unexpained "access denied" troubles keeping people from your content? Go to admin/content/node-settings, and try the 'Rebuild Permissions' button.
If that doesn't work, see other ideas for access denied for visitors and access denied for admins.
Hello! I just would like to give a huge thumbs up for the great info you have here on this post...
I may not have a chance to test that for a while, but meanwhile I welcome commentary from anyone...
Hey,
Since I still see some links here, and the guide is quite good, I thought that I may...
Nice article i like the way you thoroughly wrote it.