Support

Admin issue: delete the .htaccess and .htpasswd files from the administrator folder. Do not touch the .htaccess file in your site's root.

Login issue: when restoring the site you have a few fields that you need to pay attention to.

• The Live Site should normally be left empty. If your dev site doesn't work you want to fill in the exact URL you are using with your site, e.g. http://www.example.com You must use the correct protocol (http or https) and the correct subdomain (e.g. with www). You will ONLY be able to access the site if both the protocol and exact subdomain match. In the example above you can NOT access the site correctly as https://www.example.com or as http://www.example.com.
• There are two fields for the cookie domain and path. Normally they should be left empty. On some servers Joomla! cannot identify the domain and path correctly so you need to enter the values matching your development site. If your site is http://www.example.com/joomla then the domain is www.example.com (no protocol; pay attention to the subdomain just like above) and the path is /joomla Please remember that if the cookie domain is set to www.example.com you will NOT be able to access your site as a logged in user if you are accessing it as example.com (without the www).

So, based on the above I assume that you are accessing your dev site without www but the cookie settings OR the live site (which is the fallback when the cookies settings are blank) are set up for a domain name with the www subdomain (or vice versa). So you are logging in, a cookie is created but since it's for the wrong subdomain Joomla! doesn't see it and tells you that you are not logged in. This is how it is supposed to work, cookies are the only way sites have to persist information during (and across) a browsing session. If the cookie ends up being set up incorrectly your site cannot see the information which lets it know that you have logged in. Therefore, you are a guest.

but the extra password prompt did not show up

This is correct. We deleted the .htaccess and .htpasswd from the administrator folder to remove that feature since it was causing your web server, Apache, to choke. You can try using the Password Protect Administrator feature of Admin Tools again to create a new set of .htaccess and .htpasswd files appropriate for your server. If the problem happens again remove these files once more and ask your host if they allow you to password protect directories using .htaccess files.

Invalid Joomla Configuration settings detected

Absolutely nothing to do with the previous fix. It is what it says it is. The setting for the "Temp-directory" in Joomla!'s "Global Configuration" page points to a directory which cannot be written to by your site, therefore your site won't work. There should be a button under that message proposing to fix it for you. Have you tried it?