I ran into this issue and the solution was appallingly simple...my browser was caching the #1045 error page. After I added a password for 'root' using the phpMyAdmin 'Privileges' tab, I also edited the config.inc.php file to use this password. These are the proscribed steps for securing the 'root' login for mySQL, so I thought I was done, but I consistently continued to get the #1045 error.
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