I have the same problem, it only seems to be in firefox, but there is a catch. Perhaps this will help someone to figure out exactly what the problem is (and perhaps only specifically for me), but it dosn’t seem to work with the subdomain of “www” in the address, but if you just put in https://jasondunstan.com in firefox and go to the site, you can put the password in and it works fine.
I am however, just experiencing the same problem as others, you input the correct password, and it refreshes but doesn’t seem to accept the cookie that says the password has been input, so it brings up the mainpage with the password form still there and the post still invisible.
