Constant Contact Newsletter 2.0.3 and 2.0.4 does not work with Contact Form 7 v3.31. I'm not sure if it's due to incompatibility with WP 3.4.2. But, when I deactivate Constant Contact Newsletter, then Contact Form 7 works just fine.
What do I mean by not working?
There is no form shortcode shown the Contact Form 7's admin area (in the brown box), and the "Generate Tags" box is missing. Also, my Constant Contact lists are no longer there.