Hi Ashur,
I did start out using Google Chrome (with many problems -- but only on this web-to-lead form within Method, everything else seems ok), but eventually switched to Safari and that may be the reason for my partial success. I may have initiated some form attempts in Chrome before switching to Safari, which I'm sure compounded my problems.
HOWEVER, I have spent another lost couple of hours just now creating the form from scratch in Safari, encouraged in thinking it might be just a problem with Chrome. I'm disappointed to report that I got all the way to the bottom of the Step 8 table with all my edits, clicked finish, and received a proper screen detailing 2 errors (if it matters, fields should be required to use them in a formula). On clicking edit on those fields to try to correct the problem, I apparently lost my cache again, and was sent back to step 2 with all my information lost --- again.
I guess I will try Firefox next, as you mention it by name, but am disappointed it's not just Chrome. You should at least put a temporary warning on the Web-to-Form screen of which browsers are supported, so others don't have to lose a work day as I just did. Ok, back to it, from scratch again since presumably my newest attempt is "broken" too.
-Philip