Remember?

Is anybody else having difficulties with the "Remember Me" aka "Persistent Logins"? I've tried a laptop with Vista, a tablet with Android and a phone with Android, and the same thing happens. I log in on the home page, select something I want to read, and click on it. But when the next page loads I'm logged out again. When I'm reading a long story like "Whisper" it gets annoying. My account page says I have one persistent login, but I see no way to toggle that setting to test it.

So, anybody?