I also noticed the website "update" on Monday. I happened to be on Facebook, which rarely happens, and I saw people talking about their reward points disappearing. So I went to log on and it prompted me to update my password. And like Wor-Gar, I decided to let them sort it all out first before I did that, just in case it was some scam or there were still problems.
So, some people got an email telling them to change their password? Or are they waiting for a confirmation email once they started the process of changing their password?
Regardless, Sideshow really should have sent out an email or posted something on their front page or even on Facebook telling people they're working on the website.