I thought there was one somewhere but I couldn't find it. I never use that one.

When I first put the pop-up form on the site, I had a link on every page iin the footer and it worked (responded) just fine.
It was up and running for a week or so (I have witnesses! ), then I thought maybe all those forms would slow the site down so I removed them. Made a new form and put the link only on the contact page.

Are you sure it was being responsive? You posted with us in the thread.
http://www.coffeecup.com/forums/web-for … esponding/

That was before I created this site, and I just assumed that tweaks/changes had been made to the FB since the last time I had used it, which was before that post. This most recent site is the first time I've used the pop-up menu.
I tested it on several devices and was relieved to see it worked fine on a friend's ipad as well as my client's iphone (since I have no Apple devices to test with).
Are we all in the Twilight Zone?
In the FB settings, it even has a percentage width and no height... that would seem to imply a non-static size.

I guess I'll have to do the skinny form idea for now and hope responsiveness returns to the pop-up option.
It seems odd that a responsive form option switches to fixed width when embedded in a responsive site. It seems CC would have a warning that a responsive template will no longer be responsive if the pop-up option is selected.

I have a popup contact form on a site and I made it skinny to make it work with phones because it wasn't responsive. I haven't had the time to get it responsive yet.

Add this to the head of your page that has the link to the popup form to make the colorbox popup responsive. I forgot this script existed.