This is for those who want the speed boost of js minify but are experiencing conflicts with Gravity Forms. I'm no expert in any of these plugins, but I wrestled with GF configuration for quite some time before contacting GF who looked at my site and said it was probably a caching plugin issue. Then I wrestled with W3TC configurations. It works now, so I am sharing my solution.
Writing this for search, so please excuse the phrasing that follows:
Gravity Form will not display. Gravity Form conflict with W3 Total Cache js minify.
My solution:
STEP ONE: Dashboard > W3 Total Cache > General Settings > Minify > Minify:Enable AND Minify-mode: Manual
STEP TWO: Dashboard > W3 Total Cache > Minify > Advanced > Under "Never minify the following pages:" insert http://<your-site's-complete-url-here>/plugins/gravityforms/js/
The first step tells W3 Total Cache to look for exceptions. The second step clarifies which folders should be "excepted."
I used tips from the following sources to reach this solution:
Inspire2Rise's guide to W3 Total Cache settings: http://www.inspire2rise.com/w3-total-cache-settings.html
W3 Total Cache installation guide recommendation #6: http://wordpress.org/plugins/w3-total-cache/installation/
W3 Total Cache support thread: http://wordpress.org/support/topic/plugin-w3-total-cache-minify-conflicts-with-gravity-forms