I've moved this to the appropriate area. You might try clicking the "Delete all board cookies" link in the bottom right corner and then log back in making sure to check the box for "Log me in automatically for each visit". I can't duplicate the issue your having and I haven't experienced it on any of my devices (2 laptops, tablet and phone). It's possible that there is a setting on your device preventing the feature from working properly. Start with deleting the cookies and see if that corrects the issue.
There is nothing more important than this one day.