Yup...tried on my laptop and said my username/e-mail and/or password was invalid. I have an "auto-login" so I know it was entered correctly and it hasn't changed since I created it. After the 4th try, it finally logged me in, but then Stitch at all of the pages I tried to go to...if the links even worked!
I tried the app on my phone and it won't even let me log in...says something is wrong and to try again later.
...and it logged me out on the laptop and I get the same message again that my password and e-mail are invalid...
Disney IT must be trying to "upgrade" something. My log in worked fine on the DVC Member website so I doubt it is a "system-wide" problem.