The contact form on my client's site is accepting and storing information in it, We are using GF Version 1.6.7 and the 1.7 MC addon on the live site, and 1.6.3 of the MC addon on one of the dev sites, since this thread seemed to suggest that a rollback might help, and I had gone back all the way to 1.5 at one point (which I had thought was working but apparently not):
I thought it was a double opt-in issue, but the subscription isn't happening either with or without that checked. I installed the GF Logging Add-On that Chris H sent me, and this is the info that I am getting back:
Transaction failed. Error 270 - "Recipes" is not a valid Interest Group for the list: ChefsBest Subscribers
And based on the array dump in the logs, this is what is being sent:
[GROUPINGS] => Array
 => Array
[name] => What news would you like to receive?
[groups] => Recipes, tips, and news
It looks to me as if it is treating the groups as a comma delimited list, when in fact the whole group is: "Recipes, tips, and news", so it is correct when it returns the error '"Recipes" is not a valid Interest Group', and maybe it should be enquoting the group.
Any help is appreciated.