[Tech Guy]

I've been using CC for a long time with no problems. I always connect to my Calibre library on Dropbox, and it has always connected directly. But just now, when I pressed "connect", it had me log on to Dropbox. I entered my login info, and then I got a strange dialog that seems to be from or related to Arkose Labs. It spoke a number, asking me to enter that number.

I didn't know what it was, so I dismissed it, and tried logging in using Google instead. But that didn't work, because after the usual confirmation, it asked me for a number on "the other screen", but there was no "other screen" available. I tried looking for it, but that caused it to cancel.

Then I tried the first method again, after confirming I could log in to Dropbox from the Dropbox app normally, which I could. This time, I again got the Arkose Labs prompt, but it asked me to do something to prove I was human, which I did, and then CC connected.

My question is whether this is a CC validation, or Dropbox. I Googled, but couldn't find anything for either connected to Arkose Labs.