Nope… I just checked from two different devices and everything seems to be working fine.
The only common issue is people trying to use the wrong password, or the right password and the wrong instructions – make sure you’re on the right page for your kit and you’re using the password that’s in the letter that came with your kit.
There are a couple of videos that have different passwords because they’re shared between different instruction sets, but the password for those ones is shown in the caption below the video, so that shouldn’t be a problem.
If something else is going on, please send me an email with the URL of the page you’re on and a description of what’s happening.