UPDATE: I think I've figured it out... or at least how to fix. It must be that a change in GF 1.7 is not compatible with something cached from previous versions. I went to /wp-content/cache/supercache and deleted the "spudpickles.com" folder, and did the same in /wp-content/cache/blogs. This forces a full re-fresh of the site's cache, because that's all the files for the cache. Once I did that and reloaded the pages in an incognito (Chrome) window, to ensure I was not logged-in, they loaded up fine. I also check the source and at the very bottom WP Super Cache puts some text to let you know if the page is cached or not. It was cached, so it had rebuilt the cache for that page, but now the form was showing up just fine.
There was no cache folder(s) for the imagesbeauty.com.au site, so I just re-activated caching on it, and the form on the home page is working fine there as well. Not sure if this is the same problem everyone else on this thread is having, but it sounds similar. So for people like Wilco who originally started this thread, I'd say try deleting everything inside the wp-content/cache/supercache and /blogs folders. See if that fixes it. It did for me!
Posted 9 years ago on Monday May 13, 2013 | Permalink