I've tried testing out the new Sales Documents feature but it hangs up at the very beginning. It asks me to Log In. When I click the button it opens a new window and I enter in my information. Then it says "One moment please" then that popup goes away and I'm back to the screen asking me to Log In.
I normally use Mozilla so I tried it on Chrome as well with the same result.
I use many different Google logins. I don't know if that makes a difference somehow. But I tried it with only the Pipedrive site open, to make sure I wasn't automatically logged in as a different account. Same result.