Fresh install and unable to edit any global areas.

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I installed a new version of the site, taken today from the stable version on the concrete5.org site.
The list of issues I have encountered:

Install page failed on the "Installing Dashboard" Ajax success functions. I had to resume bye manually calling the next function

After installing a new theme I've written, I was confronted with a 404 for the included files
(called by:
<link rel="stylesheet" href="<?php  echo $this->getThemePath()?>/css/bootstrap.css">

).
This was caused because the code was looking into the concrete/themes folder only - So I worked around by copying the theme there.

Now I am unable to modify Global Areas, with the error "Unable to get permission key for add_blocks". I have no idea how to deal with this one.

All this is on my XAMPP server on W7, default install - and has worked fine with everything beforehand including installations of older concrete versions.

So my question is, as theres not much content yet, is it best to restart my efforts, and do I do so with the current (broken for me) version, or do I go onto the github repo and download an older snapshot of the code.

Sam