I posted this same message on a forum at diythemes, the home space for the Thesis Theme, since the problem may (or may not) be theme-related.
I lost a day of work yesterday after I tried to follow this Creative Slice tutorial. My project was to build an interface that front-end users can use to submit items directly for a Local Food Calendar I've built with Event Calendar Pro. (See widget at http://www.savoringkentucky.com) Instead, I lost hundreds of calendar events I had entered earlier in the day, after tech help at my web hoste tried 45 minutes of other fixes that did not restore the site from a blank white page. Eventually it seemed the only option to restore my completely disappeared site was to restore to the previous night's full save at my web host (Bluehost.) Simply restoring the custom_functions.php file to its earlier state did not restore the site.
I had tried several steps of the tutorial without entering the code, because of the age of the tutorial and the new version of Gravity Forms now available. Nothing worked, though, so I tried following the instructions about adding the code to (I thought) the custom functions file. Instantly the site stopped functioning and delivered a 505 error when I dropped the code in the top box in the tutorial into my custom_functions.php file. I cannot find out what happened and how to prevent its happening again, other than a Gravity Forms promo suggestion from Sugarrae that describes problems she had because of a plugin conflict. Problems - yes - the form didn't work, but it didn't eviscerate her site. (And I'm not using that particular plugin.)
I'm posting just as a "go slow" for people who are considering using the Creative Slice tutorial, and who may, like me, not have enough tech skills to know how to troubleshoot, or how to keep a site safe.
I am using Thesis 1.8 on WordPress 3.2.1, Mac 10.6.8, Gravity Forms 1.6.1, Event Calendar Pro 2.0.1. When I turned on my computer this morning I had a message that a secondary Gravity Forms plugin, Gravity Forms [Plus] Custom Post Types had been deleted because of a problem. That was a first.
Also, I am now completely at a dead end with my project, which was the reason for my purchasing Gravity Forms (personal). I am unable to determine whether purchasing the Developer version, which comes with more support, makes sense, or whether I need to abandon the possibility of front-facing form use.