Most of the Blogspot sites I visit allow me to comment as my Google account, by default. But others require me to 'select profile'. I select 'Google account'. It tells me to sign in (even though I already am), and when I do so I get the following very helpful message: 'Cookie value is null for FormRestoration'.
Any hints/tips? I'm reluctant to throw this into the seething swamp of Google's so-called 'help'.
Anyway, if you're craving comments from me but not getting any, it's not for lack of trying!