Unable to change Direct Connect password

I'm trying to download transactions from my bank and Quicken is asking me to change my Direct Connect password, I do this every month and I don't recall it asking me to do this before. In the Change Assigned Password dialog I enter a complying password but the Change Password button remains disabled. None of the yellow caution icons turn green as I'd expect them to. I AM able to change the relevant password in the Edit Password Vault dialog, but Quicken still tells me to change it again when I run Direct Connect, and the problem recurs. I'm running R36.57 on Win10 x64.