For those still having issues with getting your CF7 submissions into Campaign Monitor, it may be a matter with your PHP environment. The plugin prefers CURL as the primary means of communicating with Campaign Monitor. If that doesn't exist, it tries to use a socket connection. If either of these functions exist and are allowed to be called from within the PHP installation on your server and information is still not getting passed to Campaign Monitor, it might be a firewall issue blocking outbound http/https traffic.
thv20 - I did test the plugin against the newest version of WP and CF7. Neither caused any failures within the plugin.
jkid10 - I know that I haven't updated the plugin in a while, but it required no update. The day before I pushed version 1.00, it was submitting contacts to my CM account without fail.
ignitionmedia - I do apologize for not getting back sooner. I thought I had this forum set up to notify me when new posts were made, but it never did.