From my post to the mailing list:
It turns out that it works fine in IE but not Mozilla (at least
1.00 release candidate 3 - I will try an upgrade).
What I had done to create the corruption was to omit a closing
quote around a url in a link. Easily fixed in safe mode in IE.
My IE was crashing, but that is another story, reinstall,
reactivation 24 hours later...
Now IE is working, Blogger is working, Yay! I will keep you
posted re latest version of Mozilla, as it would be good to have
that functionality there too. Can others use Safe Mode to fix
such things in Mozilla?