Fieldsets not appearing on node form

Rereading my original quote above, I misstated the issue ... what I meant is that on a node's edit form, no "block select box" per: "On the content node form, a select box will be available to select the appropriate block where the node content must be displayed." I have Title, Body, Tags, Image, and the seven standard vertical menu tabs. That's it. I have a good idea of what should be appearing. I suspect that this is related: since enabling Nodes in Block, I'm getting a "Visibility field is required" error message on saving a node (article or blog page). There's nothing in the module's documentation that mentions the need to add a field. I suspect that this refers to the fieldset that I can't see or configure. I'd be fine if it was something simple on my end, but I've rechecked all of the configuration pages ... everything appears properly set up. Thanks!

Yes, that was the problem. Clearly all Admin permissions should not be blindly checked. Thanks!