Just to further clarify, let’s make sure we’re all talking about the same thing. We switched to session-based cookies when you don’t check the “remember me” box. The general functionality for a session-based cookie is to last until the browser is closed.
Sadly, there’s not a clear standard on what “closed” means, so it varies from browser to browser. For most of them, it means closing all the windows for the browser (not the tab for the site). I know that in the latest iOS, for example, they expire those cookies after one day of inactivity. I also suspect that ad blockers are going to affect this behavior.
So, for all the folks encountering problems, either post some details here or reach out via that contact form and let us know about your OS, browser, scripts, and any extensions you’ve got running. Try disabling any ad blockers for WK (we don’t do ads), too, and see if that helps.
Checking “remember me” when you sign in should solve all the problems, as that “should” behave exactly like it did before this change.