I managed to get the offer. It will be handled in the next version of Unchecky.

Closed due to a lack of feedback.

Hi Barbara,

A checkbox like this is not a goal of Unchecky.
Unchecky is designed to remove checkmarks from checkboxes that offer to install sponsored or unrelated programs, or to change the homepage or the search engine. The "Keep me signed in" checkbox doesn't fit into that category.

If you often need to sign into your email account without Yahoo remembering the credentials, you might want to use incognito mode.

Hi Barbara,

Sorry for not replying earlier. Could you please clarify which check mark are you talking about? Is it in the Yahoo website, or in a program? A screenshot would help.

Thank you for the support!

Спасибо! Исправим в следующей версии.

Thanks for the feedback!
An option to clear the activity log will be added in the next version.

Проблема решается удалением обновления KB3072318. К программе Unchecky проблема отношения не имеет.
http://superuser.com/questions/947698/windows-8-1-jump-list-visual-bug