When I add custom code (which I suspect most users don't do) - it automatically adds slashes, I assume some form of escaping the code... and that works fine. However if I ever go back and edit another setting, it re-escapes the code (adds more slashes) and when I save, my tracking is now broken. I actually utilize the same GA tracking on multiple subdomains which each have their own install of WP, and this happened on one subdomain. Took me 3 months to figure it out and fix the error. OOPS! - anyways, I assume most people would notice they weren't getting any data before I did, but still is a bug worth fixing.
http://wordpress.org/extend/plugins/google-analytics-for-wordpress/
