Suddenly today when I try to log in to DDB with my Twitch login (which I have done since DDB began) I am asked to prove I'm not a bot by entering a code sent to my email. This is happening on computers I've always used for DDB, even though it says I am trying to log in to a new device. Is this going to happen every time I log in?

Do you use a VPN or maybe some kind of cookie blocker?

 I use NoScript on Firefox, but I've been using it for years. I haven't changed anything. Also, it's happening on multiple computers from different locations, computers I've used with DDB since launch.

Got it again today.

I think this is a change implemented by Twitch. Try clearing cache and cookies and trying again. It may be a problem saving the cookie when you have an "older version" cookie. 

It's not so much "check for a bot" and more like an extra step to ensure you're the correct person - so even if somebody found out your Twitch password they may not have access to your e-mail so this gives that extra step of security in case of a compromised password.

This is why I mentioned checking for a bot. This is what happens after inputing my credentials, and before it asks me for a 2FA code. I also tested your hypothesis by clearing all cookies from my cache in Chrome and still got the above and below when trying to log in to DDB/Twitch.

The bot thing is different. That, if it did check if a bot, brings up a puzzle - you solve the puzzle by rotating it to the right position. It is a different thing than the new verification. It could be clashing with your NoScript add on (it shouldn't but ya never know), so try turning that off temporarily and see if that resolves it. If it does, maybe contact Twitch to make a patch?

Hello mjsoctober! That particular issue is tied to Twitch's authentication system. I would recommend reaching out to Twitch Support for assistance.

Quote from MellieDM >>

Hello mjsoctober! That particular issue is tied to Twitch's authentication system. I would recommend reaching out to Twitch Support for assistance.

 I've reached out to the Twitch Support twitter account. Yesterday. I get the feeling they don't actually provide support. :-/

This is a direct link to submit a ticket to them, hopefully that's more helpful for getting a response!

I tried the Twitch support ticket link MellieDM (Thank you for the suggestion). Unfortunately the support ticket page doesn't give you a place to describe the problem, it only allows you to select from various prepopulated drop down menues.

I am giving up on Twitch login. Is there a way to switch my DDB account from Twitch to Google?

EDIT: Nevermind, I've figured out how to link my account to Google.

Thanks, all.