Damn it. Now the mobile app is broken and is requiring a password reset. So I made it ~2 weeks not using the website but now I'm stuck completely. Off to change my password and hope I don't run into all the issues many of you have with endless loops. And if they are going to force me to change my password every 'x' days I'll figure something else out.

Edit 1: well that didn't work. Enter my current and new password. Have to verify my account with the six digit code. Enter that and click Next and I'm brought back to a half blank screen with the Marriott logo and entry boxes for current and new password with absolutely nothing else on the screen. No, "your password has been changed" or "that password is not valid, try again". So I'm stuck like the rest of you.
Edit 2: Had to use the "forgot password" link as nothing worked after that. It told me the first three passwords I tried were already used (I guess they must save this for many years as I haven't changed my password in a really long time). I entered one that it finally took. The mobile app also lets me login now as well.

-RM