No dice. Deleted all of Chrome's cookies, history, downloaded files, cache, etc since the beginning of time. Same issue. I logged in as myself, didn't have the checkbox on Upload Field Notes. I logged out, logged in as the wife, and she did have the checkbox.
So, I tried Internet Explorer. I have only used that browser once on this computer--when I used it to download Chrome. So, I logged in as myself, no check box. Logged out, logged in as the wife, checkbox.
Then, I tried a different computer. Internet Explorer. Same deal.
I think gc.com remembers when you last uploaded your field notes, not by referencing a cookie on the individual computer. The "Ignore logs before" date on the wife's account was the same on both computers. I'm pretty sure I've never uploaded my field notes from her computer before.