Hi bernard - there is a small bug here, but I may have a workaround for you. Just enter something, anything at all, into the OTP field and it will hopefully allow you to generate a new address (at least it does for me). You should be able to leave the OTP field blank if you don't have the login TFA set up, so that's the bug I think. The OTP is only required for generating addresses if you have enabled TFA for login and funding. I suspect that the bug has something to do with the settings lock being enabled as well, because I couldn't reproduce the behavior with the settings lock off.