Just finished my 3rd complete reinstall & each time I followed your instructions to the letter.
The js & css includes are in the headinclude template because i'm using the home page addon. As for your questions ..
All plugins are working.
AdminCp info shows up & can be changed.
I can also add & delete items fine.
The content of the items just continues to show the loading over & over.
To this point I have only seen the ajax function move between the items once.
That seemed to be during a forced page refresh. Even when that did happen the content area still only displays "Loading"
I'm not sure what this issue is. . I've looked for any path that may be off & cannot find any issue. One thing I have noticed though is when I change the options in the admincp (enable, modcp, bbcode) it doesn't seem to make any difference. The block still shows & nothing about it changes at all after I change those options. In fact when it installs, it is not enabled by default & still shows if the block is created.
enjoy your sleep, I'll look forward to any help you may have