This is strange... I've got this plugin installed on two sites installed on the same server. On my wife's site, it works fine. I had trouble with another Analytics plugin not working, so I nuked it and installed this one, since it's working for my wife. However, when I go to the plugin's config page, I get this error:
Fatal error: Cannot use string offset as an array in /(wp_content_path)/plugins/google-analytics-for-wordpress/admin/class-admin.php on line 323
Even more strange - when I log into my FTP server and look at my wife's site, her "google-analytics-for-wordpress" directory contains only two subdirectories (images and wp-data) and nine files. My site's non-functional "google-analytics-for-wordpress" directory, on the other hand, has SIX subdirectories (admin, frontend, images, inc, js, and languages) and only four files.
Version 4.3.1 is installed on both sites (and both sites are using WP 3.5.1) though they have completely different sets of files, and only one of them works. Why the very different sets of files, and what might be causing the problem on my site?
Possibly relevant: my site's 4.3.1 is a fresh install of the plugin. My wife has been using the plugin for awhile, so hers is an upgrade from a prior version of the plugin.