Bloggers Trying To Login, Seeing "The page isn't redirecting properly"

Recently, we're seeing numerous reports from people in Blogger Help Forum: Something Is Broken, unable to successfully login to Blogger.
I cannot log into Blogger - I keep getting this error
The page isn't redirecting properly.

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
In a few cases, we are seeing a key clue to the cause of the problem.
This problem can sometimes be caused by disabling or refusing to accept cookies.
And this now looks like another case of overly aggressive layered security procedures and settings.

Some time earlier, we had reports of people being forced to repetitively login - and other times, people who reported seeing
Conflicting edit

There was more than one attempt to edit this resource at the same time. This may have been because you double clicked on a link or a button or because someone else is also editing this blog or post.
The latter would be seen at random times, when trying to maintain or post to the blog. Sometimes the problem would go away by back spacing and trying again - but generally, the best recovery would be to clear cache, cookies, and sessions, restart the browser, and try again.

In extreme cases, it would be necessary to laboriously check all cookie filters - and maybe also, to stop clearing cookies regularly.

Now, it looks like Blogger has rewritten their blog ownership / cookie handling / login procedure, similar to how they rewrote their commenting / cookie handling / login procedure, some time ago.

The bottom line is that the previously seen login loop, where the blog owner (or guest trying to comment) formerly was made to manually click on various links from screen to screen, is now being forced through an automatic loop between the login displays - and the login loop is now being detected by the browser.
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
Regardless of the exact symptoms - reported by people using Firefox, or any other browser - anybody desiring to publish comments (non anoymously) on any blog, or to publish posts or maintain one's own blog, needs to carefully check all cookie and script filters, and to consider the necessity of regularly clearing cookies.

(Update 2012/04/10): Latest reports of this problem indicate the involvement of Blogger accounts using Google+ profiles.

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