Yeah, it's doing this to me now, too. Don't know about the logout part, I don't logout. But when I close the window, and come back, and open a tab into head-case, it's white again. And the bottom left hand corner is slightly different -- instead of just having a single "Change Theme" button, it has a thing that says click to change manually, and when I click it, it refreshes with the InfiniteDark theme.