It seems that my 'favourite' thing - cookies, could be to blame once more. I toddled off and checked my Internet settings but I had already set Internet Explorer to accept 3rd party cookies (probably during the trial and error of trying to get Blogger not to count my own page views), so I'm not preventing people commenting on my blogs - it didn't help with the problem of commenting on other people's though.
I also note that I am not alone in having this problem, in fact when I Googled the topic I got a page full of relevant hits.
Trying another suggested angle I have just investigated OpenID - apparently I have one already - well fancy that!
So off I went back to A Family Tapestry, where I'd already tried several times to get the page to recognise me as a Blogger user with my Google password, and retyped my comment (I knew I should have copied it to Notepad, but you only think of these things afterwards) and this time I selected OpenID from Select profile drop down. I had to paste in my Blogger URL (barnsleyhistorian.blogspot.co.uk) another page asked me for some confirmation and then it took me back to A Family Tapestry. But ... (fanfare) ... this time when I clicked Publish it worked.
|My comment on A Family Tapestry today|
Trying to comment on another blog I follow, Olive Tree Genealogy, (I've never been this chatty!) I hit on the CAPCHA problem. That's where no matter how many times you try entering the mystery word it won't recognise that you've got it right. The site knew I was BarnsleyHistorian this time (unlike A Family Tapestry) but trying to publish my comment with that option selected it just kept telling me I was wrong. So I tried the OpenID option ... and again ... success. Though comments are moderated on this blog so I'll need to check back later to see if my posting was truly successful.