First of all, I want to say how absolutely GREAT 3.5 and the 2012 theme are...this is a mind-blowing accomplishment, and I absolutely LOVE working with 3.5 and the 2012 theme. Hats off to all in the WordPress team!
This is a new install, not an upgrade, using 3.5 twentytwelve 1.1. It's a Multisite set-up; although I have multiple themes, this test uses the unaltered default theme only. I'm able to get a featured image, and have it show up inside the featured image meta box INSIDE a page I'm editing, I'm just not able to "publish" it to the world.
I see checkboxes, but no option buttons in my set-up.
What am I missing, or doing wrong?
Here's the CODEX pages I'm looking at for guidance:
According to this page in CODEX, the theme has to support thumbnails
My functions file seems to be set up as necessary for the featured image--here's a screenshot:
I consulted THIS page in CODEX:
The relevant part from the CODEX is this:
To show the "Featured Image" meta box in multisite installation, make sure you update the allowed upload file types, in Network Admin, Network Admin Settings SubPanel#Upload_Settings, Media upload buttons options. Default is off.
Here is a screenshot of the Network Admin, Network Admin Subpanel Uploads Setting:
Thanks again for any insights you may have.