Now, to confuse the issue, I just noticed this extra Time Zone setting while in Classic, under Profile:
Here's the problem I think. Notice the setting is for Pacific? I select EST, save, and it keeps defaulting back to PST. I have tried it several times with different zones, and each time it defaults to PST. I think this setting, which resides within the Classic interface, which is screwy right now, is the setting that controls the Beta. Anyway, that's what I'm guessing at this point. Because I'm confused as well.